{"id":618248,"date":"2023-03-01T08:15:54","date_gmt":"2023-03-01T08:15:54","guid":{"rendered":"https:\/\/www.indcareer.com\/schools\/?p=618248"},"modified":"2024-06-16T05:22:48","modified_gmt":"2024-06-16T05:22:48","slug":"ncert-exemplar-class-12-biology-chapter-5-principle-of-inheritance-and-variation","status":"publish","type":"post","link":"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-5-principle-of-inheritance-and-variation\/","title":{"rendered":"NCERT Exemplar Class 12 Biology\u00a0Chapter 5: Principle of Inheritance and Variation"},"content":{"rendered":"\n<p>NCERT Exemplar Class 12 Biology&nbsp;Chapter 5: Principle of Inheritance and Variation. NCERT Exemplar Solutions for Class 12 Biology&nbsp;Chapter 5 Principle of Inheritance and Variation prepare students for their Class 12 exams thoroughly. <\/p>\n\n\n\n<p>Biology&nbsp;problems and solutions for the Class 12 pdf are provided here which are similar to the questions being asked in the previous year&#8217;s board. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ncert-exemplar-class-12-biology-nbsp-chapter-5-principle-of-inheritance-and-variation\"><strong>NCERT Exemplar Class 12 Biology&nbsp;Chapter 5: Principle of Inheritance and Variation<\/strong><\/h2>\n\n\n\n<p>Class 12: Biology&nbsp;Chapter 5 solutions. Complete Class 12 Biology&nbsp;Chapter 5 Notes.<\/p>\n\n\n\n<p><strong>Multiple Choice Questions<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>All genes located on the same chromosome:\n<ul class=\"wp-block-list\">\n<li>a. Form different groups depending upon their relative distance<\/li>\n\n\n\n<li>b. Form one linkage group<\/li>\n\n\n\n<li>c. Will not from any linkage groups<\/li>\n\n\n\n<li>d. Form interactive groups that affect the phenotype<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Conditions of a karyotype 2n \u00b1 1 and 2n \u00b1 2 are called:\n<ul class=\"wp-block-list\">\n<li>a. Aneuploidy<\/li>\n\n\n\n<li>b. Polyploidy<\/li>\n\n\n\n<li>c. Allopolyploidy<\/li>\n\n\n\n<li>d. Monosomy<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Distance between the genes and percentage of recombination shows:\n<ul class=\"wp-block-list\">\n<li>a. a direct relationship<\/li>\n\n\n\n<li>b. an inverse relationship<\/li>\n\n\n\n<li>c. a parallel relationship<\/li>\n\n\n\n<li>d. no relationship<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:\n<ul class=\"wp-block-list\">\n<li>a. Autosomal dominant<\/li>\n\n\n\n<li>b. Autosomal recessive<\/li>\n\n\n\n<li>c. Sex-linked dominant<\/li>\n\n\n\n<li>d. Sex-linked recessive<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?\n<ul class=\"wp-block-list\">\n<li>a. G G G<\/li>\n\n\n\n<li>b. A A G<\/li>\n\n\n\n<li>c. G A A<\/li>\n\n\n\n<li>d. G U G<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Person having genotype IA IB would show the blood group as AB. This is because of:\n<ul class=\"wp-block-list\">\n<li>a. Pleiotropy<\/li>\n\n\n\n<li>b. Co-dominance<\/li>\n\n\n\n<li>c. Segregation<\/li>\n\n\n\n<li>d. Incomplete dominance<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Z Z \/ ZW type of sex determination is seen in:\n<ul class=\"wp-block-list\">\n<li>a. Platypus<\/li>\n\n\n\n<li>b. Snails<\/li>\n\n\n\n<li>c. Cockroach<\/li>\n\n\n\n<li>d. Peacock<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>A Across between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?\n<ul class=\"wp-block-list\">\n<li>a. TT and Tt<\/li>\n\n\n\n<li>b. Tt and Tt<\/li>\n\n\n\n<li>c. TT and TT<\/li>\n\n\n\n<li>d. Tt and tt<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:\n<ul class=\"wp-block-list\">\n<li>a. The allels of two genes are interacting with each other<\/li>\n\n\n\n<li>b. It is a multigenic inheritance<\/li>\n\n\n\n<li>c. It is a case of multiple allelism<\/li>\n\n\n\n<li>d. The allels of two genes are segregating independently.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following will not result in variations among siblings?\n<ul class=\"wp-block-list\">\n<li>a. Independent assortment of genes<\/li>\n\n\n\n<li>b. Crossing over<\/li>\n\n\n\n<li>c. Linkage<\/li>\n\n\n\n<li>d. Mutation<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Mendel\u2019s Law of independent assortment holds good for genes situated on the:\n<ul class=\"wp-block-list\">\n<li>a. non-homologous chromosomes<\/li>\n\n\n\n<li>b. homologous chromosomes<\/li>\n\n\n\n<li>c. extra nuclear genetic element<\/li>\n\n\n\n<li>d. same chromosome<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Occasionally, a single gene may express more than one effect. The phenomenon is called:\n<ul class=\"wp-block-list\">\n<li>a. multiple allelism<\/li>\n\n\n\n<li>b. mosaicism<\/li>\n\n\n\n<li>c. pleiotropy<\/li>\n\n\n\n<li>d. polygeny<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:\n<ul class=\"wp-block-list\">\n<li>a. males and females, respectively<\/li>\n\n\n\n<li>b. females and males, respectively<\/li>\n\n\n\n<li>c. all males<\/li>\n\n\n\n<li>d. all females<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to:\n<ul class=\"wp-block-list\">\n<li>a. quantitative trait<\/li>\n\n\n\n<li>b. Mendelian trait<\/li>\n\n\n\n<li>c. polygenic trait<\/li>\n\n\n\n<li>d. maternal trait<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the:\n<ul class=\"wp-block-list\">\n<li>a. results of F<sub>s<\/sub> generation of a cross.<\/li>\n\n\n\n<li>b. observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending.<\/li>\n\n\n\n<li>c. self pollination of F<sub>1&nbsp;<\/sub>offsprings<\/li>\n\n\n\n<li>d. cross pollination of parental generations<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Two genes \u2018A\u2019 and \u2018B\u2019 are linked. In a dihybrid cross involving these two&nbsp;genes, the F<sub>1<\/sub> heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?\n<ul class=\"wp-block-list\">\n<li>a. 1 : 1 : 1: 1<\/li>\n\n\n\n<li>b. 9 : 3 : 3 : 1<\/li>\n\n\n\n<li>c. 3 : 1<\/li>\n\n\n\n<li>d. 1 : 1<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In the F<sub>2<\/sub> generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are:\n<ul class=\"wp-block-list\">\n<li>a. phenotypes \u2013 4; genotypes \u2013 16<\/li>\n\n\n\n<li>b. phenotypes \u2013 9; genotypes \u2013 4<\/li>\n\n\n\n<li>c. phenotypes \u2013 4; genotypes \u2013 8<\/li>\n\n\n\n<li>d. phenotypes \u2013 4; genotypes \u2013 9<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Mother and father of a person with \u2018O\u2019 blood group have \u2018A\u2019 and \u2018B\u2019 blood group respectively. What would be the genotype of both mother and father?\n<ul class=\"wp-block-list\">\n<li>a. Mother is homozygous for \u2018A\u2019 blood group and father is heterozygous for \u2018B\u2019<\/li>\n\n\n\n<li>b. Mother is heterozygous for \u2018A\u2019 blood group and father is homozygous for \u2018B\u2019<\/li>\n\n\n\n<li>c. Both mother and father are heterozygous for \u2018A\u2019 and \u2018B\u2019 blood group, respectively<\/li>\n\n\n\n<li>d. Both mother and father are homozygous for \u2018A\u2019 and \u2018B\u2019 blood group, respectively<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>Very Short Answer Type Questions<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>What is the cross between the progeny of F<sub>1<\/sub>&nbsp;and the homozygous recessive parent called? How is it useful?<\/li>\n\n\n\n<li>Do you think Mendel\u2019s laws of inheritance would have been different if the characters that he chose were located on the same chromosome.<\/li>\n\n\n\n<li>Enlist the steps of controlled cross pollination. Would emasculation be needed in a cucurbit plant? Give reasons for your answer.<\/li>\n\n\n\n<li>A person has to perform crosses for the purpose of studying inheritance of a few traits \/ characters. What should be the criteria for selecting the organisms?<\/li>\n\n\n\n<li>The pedigree chart given below shows a particular trait which is absent in parents but present in the next generatoin irrespective of sexes. Draw your conclusion on the basis of the pedigree.<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/03\/15696898231_5a8e6cfc02_o.jpg\" alt=\"Principle of Inheritance and Variation\"><\/li>\n\n\n\n<li>In order to obtain the F<sub>1<\/sub>&nbsp;generation Mendel pollinated a pure-breeding tall plant with a pure breeding dwarf plant. But for getting the F<sub>2<\/sub>&nbsp;generation, he simply self-pollinated the tall F<sub>1<\/sub>&nbsp;plants. Why?<\/li>\n\n\n\n<li>Genes contain the information that is required to express a particular trait.\u201d Explain.<\/li>\n\n\n\n<li>How are alleles of particular gene differ from each other? Explain its significance.<\/li>\n\n\n\n<li>In a monohybrid cross of plants with red and white flowered plants, Mendel got only red flowered plants. On self-pollinating these F<sub>1<\/sub>&nbsp;plants got both red and white flowered plants in 3:1 ratio. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.<\/li>\n\n\n\n<li>For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.<\/li>\n\n\n\n<li>A, B, D are three independently assorting genes with their recessive alleles a, b, d, respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Find out the type of genotypes of the offspring produced.<\/li>\n\n\n\n<li>In our society a woman is often blamed for not bearing male child. Do you think it is right? Justify.<\/li>\n\n\n\n<li>Discuss the genetic basis of wrinkled phenotype of pea seed.<\/li>\n\n\n\n<li>Even if a character shows multiple allelism, an individual will only have two alleles for that character. Why?<\/li>\n\n\n\n<li>How does a mutagen induce mutation? Explain with example.<\/li>\n<\/ol>\n\n\n\n<p><strong>Short Answer Type Questions<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>In a Mendelian monohybrid cross, the F<sub>2<\/sub>&nbsp;generation shows identical genotypic and phenotypic ratios. What does it tell us about the nature of alleles involved? Justify your answer.<\/li>\n\n\n\n<li>Can a child have blood group O if his parents have blood group \u2018A\u2019 and&nbsp;\u2018B\u2019. Explain.<\/li>\n\n\n\n<li>What is Down\u2019s syndrome? Give its symptoms and cause. Why is it that the chances of having a child with Down\u2019s syndrome increases if the age of the mother exceeds forty years?<\/li>\n\n\n\n<li>How was it concluded that genes are located on chromosomes?<\/li>\n\n\n\n<li>A plant with red flowers was crossed with another plant with yellow flowers. If F<sub>1<\/sub>&nbsp;showed all flowers orange in colour, explain the inheritance.<\/li>\n\n\n\n<li>What are the characteristic features of a true-breeding line?<\/li>\n\n\n\n<li>In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them:<br>Tall, Red = 138<br>Tall, White = 132<br>Dwarf, Red = 136<br>Dwarf, White = 128<br>Mention the genotypes of the two parents and of the four offspring types.<\/li>\n\n\n\n<li>Why is the frequency of red-green colour blindness is many times higher in males than that in the females?<\/li>\n\n\n\n<li>If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father? Comment.<\/li>\n\n\n\n<li>Discuss why Drosophila has been used extensively for genetical studies.<\/li>\n\n\n\n<li>How do genes and chromosomes share similarity from the point of view of genetical studies?<\/li>\n\n\n\n<li>What is recombination? Discuss the applications of recombination from the point of view of genetic engineering.<\/li>\n\n\n\n<li>What is artificial selection? Do you think it affects the process of natural selection? How?<\/li>\n\n\n\n<li>With the help of an example differentiate between incomplete dominance and co-dominance.<\/li>\n\n\n\n<li>It is said, that the harmful alleles get eliminated from population over a period of time, yet sickle cell anaemia is persisting in human population. Why?<\/li>\n<\/ol>\n\n\n\n<p><strong>Long Answer Type Questions<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>In a plant tallness is dominant over dwarfness and red flower is dominant over white. Starting with the parents work out a dihybrid cross. What is standard dihybrid ratio? Do you think the values would deviate if the two genes in question are interacting with each other?<\/li>\n\n\n\n<li>a. In humans, males are heterogametic and females are homogametic.&nbsp;Explain. Are there any examples where males are homogametic and females heterogametic?<br>b. Also describe as to, who determines the sex of an unborn child?&nbsp;Mention whether temperature has a role in sex determination.<\/li>\n\n\n\n<li>A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be probability of her sons and daughters to be colour blind? Explain with the help of a pedigree chart.<\/li>\n\n\n\n<li>Discuss in detail the contributions of Morgan and Sturvant in the area of genetics.<\/li>\n\n\n\n<li>Define aneuploidy. How is it different from polyploidy? Describe the individuals having following chromosomal abnormalities.<\/li>\n\n\n\n<li>a. Trisomy of 21st Chromosome<br>b. XXY<br>c. XO<\/li>\n<\/ol>\n\n\n\n<p><strong>Answers to Multiple Choice Questions<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>1-b<\/td><td>2-a<\/td><td>3-b<\/td><td>4-d<\/td><td>5-d<\/td><td>6-b<\/td><\/tr><tr><td>7-d<\/td><td>8-b<\/td><td>9-d<\/td><td>10-c<\/td><td>11-a<\/td><td>12-c<\/td><\/tr><tr><td>13-a<\/td><td>14-b<\/td><td>15-b<\/td><td>16-a<\/td><td>17-d<\/td><td>18-c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-ncert-exemplar-class-12-biology\">NCERT Exemplar Class 12 Biology<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-1-reproduction-in-organisms\/\">Reproduction in Organisms<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-2-sexual-reproduction-in-flowering-plants\/\">Sexual Reproduction in Flowering Plants<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-3-human-reproduction\/\">Human Reproduction<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-4-reproductive-health\/\">Reproductive Health<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-5-principle-of-inheritance-and-variation\/\">Principle of Inheritance and Variation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-6-molecular-basis-of-inheritance\/\">Molecular Basis of Inheritance<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-7-evolution\/\">Evolution<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-8-human-health-and-diseases\/\">Human Health and Diseases<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-9-strategies-for-enhancement-in-food-production\/\">Strategies for Enhancement in Food Production<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-10-microbes-in-human-welfare\/\">Microbes in Human Welfare<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-11-biotechnology-principles-and-processes\/\">Biotechnology: Principles and Processes<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-12-biotechnology-and-its-applications\/\">Biotechnology and its Applications<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-13-organisms-and-populations\/\">Organisms and Populations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-14-ecosystem\/\">Ecosystem<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-15-biodiversity-and-conservation\/\">Biodiversity and Conservation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-16-environmental-issues\/\">Environmental Issues<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-ncert-exemplar-class-12-solutions\">NCERT Exemplar Class 12 Solutions <\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-physics-important-questions\/\">Physics<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-important-questions\/\">Chemistry<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-maths-important-questions\/\">Maths<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-important-questions\/\">Biology<\/a><\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-problems-solutions\/\" style=\"background-color:#f06d6d\" target=\"_blank\" rel=\"noreferrer noopener\">NCERT Exemplar Solutions<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-Biology-important-questions\/\" style=\"background-color:#f06d6d\" target=\"_blank\" rel=\"noreferrer noopener\">NCERT Class 12 Exemplar Solutions<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Exemplar Class 12 Biology&nbsp;Chapter 5: Principle of Inheritance and Variation. NCERT Exemplar Solutions for Class 12 Biology&nbsp;Chapter 5 Principle of Inheritance and Variation prepare students for their Class 12 exams thoroughly. Biology&nbsp;problems and solutions for the Class 12 pdf are provided here which are similar to the questions being asked in the previous year&#8217;s [&hellip;]<\/p>\n","protected":false},"author":302,"featured_media":618257,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"newspack_featured_image_position":"","newspack_post_subtitle":"","newspack_article_summary_title":"Overview:","newspack_article_summary":"","newspack_hide_updated_date":false,"newspack_show_updated_date":false,"footnotes":""},"categories":[1],"tags":[],"boards":[],"class_list":["post-618248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Exemplar for Class 12, Biology\u00a0Chapter 5 - IndCareer Schools<\/title>\n<meta name=\"description\" content=\"NCERT Exemplar Class 12 Biology\u00a0Chapter 5: Principle of Inheritance and Variation | Browse all Class 12 Biology\u00a0Chapters NCERT Exemplar books - IndCareer Schools\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-biology-chapter-5-principle-of-inheritance-and-variation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Exemplar Class 12 Biology\u00a0Chapter 5: Principle of Inheritance and Variation\" \/>\n<meta property=\"og:description\" content=\"NCERT Exemplar Class 12 Biology&nbsp;Chapter 5: Principle of Inheritance and Variation. 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