This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 20 (23 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In a cross between pure tall with pure dwarf, then percentage of heterozygous in F2 is A) 12. B) 25. C) 50. D) 75. Show Answer Correct Answer: C) 50. 2. Some of the dominant traits studied by Mendel were A) Round seed shape, green seed colour and axial flower position. B) Terminal flower position, green pod colour and inflated pod shape. C) Violet flower colour, green pod colour and round seed shape. D) Wrinkled seed shape, yellow pod colour and axial flower position. Show Answer Correct Answer: C) Violet flower colour, green pod colour and round seed shape. 3. ZZ/ZW type of sex determination is seen in A) Platypus. B) Snails. C) Cockroach. D) Peacock. Show Answer Correct Answer: B) Snails. 4. In mice, Y is the dominant allele for yellow fur and y is the recessive allele for grey fur. Since Y is lethal when homozygous, the result of cross Yy x Yy will be A) 3 Yellow:1 grey. B) 2 yellow:1 grey. C) 1 yellow:1 grey. D) 1 yellow:2 grey. Show Answer Correct Answer: B) 2 yellow:1 grey. 5. Sickle-cell anaemia is A) Caused by substitution of valine by glutamic acid in the beta globin chain of haemoglobin. B) Caused by a change in a single base pair of DNA. C) Characterized by elongated sickle like RBCs with a nucleus. D) An autosomal linked dominant trait. Show Answer Correct Answer: B) Caused by a change in a single base pair of DNA. 6. What is the probability of getting the gamete aB if the genotype is AaBB A) 25%. B) 50%. C) 75%. D) 100%. Show Answer Correct Answer: B) 50%. 7. The green controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes? A) 4. B) 7. C) 6. D) 5. Show Answer Correct Answer: A) 4. 8. "When two pairs of traits are combined in a hybride, segregation of one pair of characters is independent of the other pair of characters" . The statement explains which of the following laws/principles of mendel? A) Principle of paired factors. B) Principle of dominance. C) Law of segregation. D) Law of independent assortment. Show Answer Correct Answer: D) Law of independent assortment. 9. In a cross between red flower and white flower plant, the F1 was pink. Which phenomenon is exhibited here? A) Incomplete dominance. B) Codominance. C) Multiple allelism. D) Pleiotropy. Show Answer Correct Answer: A) Incomplete dominance. 10. The inheritance pattern of a gene over generations among humans isstudied by the pedigree analysis. Character studied in the pedigreeanalysis is equivalent to: A) Quantitative trait. B) Mendelian trait. C) Polygenic trait. D) Maternal trait. Show Answer Correct Answer: B) Mendelian trait. 11. In multiple allele system a gamete possesses how many alleles A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: A) 1. 12. Which of the following characters was not chosen by Mendel? A) Pod shape. B) Pod colour. C) Position of pod. D) Position of flower. Show Answer Correct Answer: C) Position of pod. 13. In a certain taxon of insects some have 17 chromosomes and the othershave 18 chromosomes. The 17 and 18 chromosome-bearing organismsare: A) Males and females, respectively. B) Females and males, respectively. C) All males. D) All females. Show Answer Correct Answer: A) Males and females, respectively. 14. If a trait passes from father to all his daughters but none of his sons, the trait is A) Autosomal dominant. B) Autosomal recessive. C) Sex linked dominant. D) Sex linked recessive. Show Answer Correct Answer: C) Sex linked dominant. 15. ..... is the study of how traits are passed on, or inherited. A) Dominant traits. B) Ratio. C) Phenotype. D) Genetics. Show Answer Correct Answer: D) Genetics. 16. DIFFERENT alleles for the same trait. Sue has 1 gene for brown eyes and 1 gene for blue eyes so she is ..... A) Dominant. B) Recessive. C) Homozygous. D) Heterozygous. Show Answer Correct Answer: D) Heterozygous. 17. Andalusian fowls have two pure forms-black and white. If black forms (BB) and white forms (WW) are crossed, F$_{1}$ individuals appear blue coloured (BW), due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form? A) 1 Black:2 Blue:1 White. B) 2 Black:1 Blue. C) 1 Black:2 Blue. D) 1 Black:1 Blue. Show Answer Correct Answer: D) 1 Black:1 Blue. 18. Given below are statements on Mendelian Monohybrid cross. Find the statement which is not correct. A) Reciprocal crosses produce same results. B) Contrasting traits appear in F2 generation in the ratio 3:1. C) Only the dominant trait expresses in the F2 generation. D) One of the contrasting trait remains unexpressed in F1 generation. Show Answer Correct Answer: C) Only the dominant trait expresses in the F2 generation. 19. Phenylketonuria is an inborn error of metabolism that is inherited as A) Autosomal recessive trait. B) Sex-linked dominant trait. C) X-linked recessive trait. D) Autosomal dominant trait. Show Answer Correct Answer: A) Autosomal recessive trait. 20. What proportion of the offsprings obtained from cross AABBCC X AaBbCc will be completely heterozygous for all the genes segregated independently? A) 1/8. B) 1/4. C) 1/2. D) 1/16. Show Answer Correct Answer: A) 1/8. 21. ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible? A) Six. B) Three. C) Four. D) Five. Show Answer Correct Answer: C) Four. 22. Is the branch of biology dealing with the principles and mechanism of inheritance and variation. A) Variation. B) Heredity. C) Inheritance. D) Genetics. Show Answer Correct Answer: D) Genetics. 23. Marriage between persons having AB blood groups would produce: A) Offsprings with AB blood group only. B) Offsprings with A, B and AB blood groups. C) Offsprings with A and B blood groups only. D) Offsprings with A, B, AB and O blood groups. Show Answer Correct Answer: B) Offsprings with A, B and AB blood groups. ← PreviousRelated QuizzesClass 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 1Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 2Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 3Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 4Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 5Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 6Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 7Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 8Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 9Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books