VARIATIONS AND HEREDITY

VARIATIONS AND HEREDITY

1 The ultimate source of variations is

a. Nature selection b. Sexual reproduction c. Mutations d. Hormonal actions

2. Genetics (Gr. genesis = to grow into), a term coined by Bateson (1906) is study of

a. Heredity b. Variations c. Both heredity and variations

d. Inheritance and variations

3. a cross between hybrid and either of any parent is called


a. Test cross b. reciprocal cross c. Mono hybrid cross d. Back cross

4. Who discarded blending inheritance and formulated particulate theory of inheritance?

a. Morgan b. Correns c. Mendel d. None of these

5. The idea of Blending inheritance was weakened by

a. Atavism b. Serendipity c. Teleogy d. Connecting links

6. Independent assortment of Mendel was proved by

a. Mono hybrid cross b. Di hybrid cross c. Incomplete dominance

d. Back cross

7. Mendel was born in

a. Austria b. Germany c. Britain d.Czechoslovakia

8. A typical genotype (hidden) mono hybrid ratio is

a. 9 : 3 : 3 : 1 b. 1 : 2 : 1 c. 3 : 1 d. 9 : 7

9. Law of independent assortment can be proved by a cross

a. YYRR x yyrr b. YyRr x YyRr c. YYRR x YyRr d. YyRr x yyrr

10. Hereditary traits are passed from parents to offspring through

a. Genes b. Cytoplasm c. gametes d. germs

11. A cross between two black pigs can produce offspring of the type

a. BB b. Bb c. bb d. all of these

12. The year 1900 was important in the history of genetics because of

a. Discovery of gene b. Discovery of linkage

c. Chromosomal basis of heredity d. Rediscovery of Mendel’s work

13. The dihybrid cross produces four types of phenotypes in ratio of 9 : 3 : 3 : 1 because of

a. Independent assortment of factors controlling the two pairs of characters

b. Crossing over c. Mutations

d. Dominance of one phenotype in each pair of characters

14. Most extensively studied material in Genetics is

a. E.Coli b. Maize c. Pea d. Drosophila

15. Expected children of a blue eyed (receive) who had a blue eyed mother are likely to be

a. All brown eyed b. All blue eyed

c. One blue eyed and one brown eyed d. Three blue eyed and one brown eyed

16. A family has 5 daughters. Probability of 6th child being girl will be

a. 1 in 2 b. 1 in 5 c. 1 in 3 d. 1 in 6

17. How many different types of gametes cab be produced by the F1 progeny resulting from the

cross

AABBCC x aabbcc a. 3 b. 8 c. 27 d. 64

18. What will be the total number of gametes, produced by a plant with genotype AaBbCcDd?

a. 8 b. 27 c. 16 d. 64

19. A genotype AaBBCcDD can produce how many types of gametes?

a. 4 b. 3 c. 16 d. 64

20. In an experiment, AaBb (F1) was test crossed with aabb. In the progeny, genotypes

Aabb,aaBb were more frequent that AaBb and aabb. The genotypes of the parents of F1

should be

a. AABB & aabb b. AAbb & aaBB c. AAbb & AABB d. AABB & aaBB

21. If mother has ‘O’ blood group, child also has ‘O” group. What will be the blood group of

Father?

a. O b. A c. B d. All correct

22. Father’s blood group is ‘a’ and his son has ‘O’ group. Which of the blood group can not be

present in mother.

a. A b. B c. O d. AB

23. Inheritance of ‘ABO’ group shows

a. Polyploidy b. Incomplete dominance c. Multiple allelism d. Polygeny

24. A man with blood group A marries a woman having blood group AB. Which of the following

types in the progeny of this couple would show that the man is heterozygous

a. Type O b. Type A c. Type b d. Type AB

25. Rh factor derives is name from

a. Monkey b. Ape c. Rhino d. Human

ANSWERS

1. c 2. c 3. d 4.c 5. a 6. b 7. b 8. b 9.b 10. c

11. d 12. d 13. b 14. b 15. c 16. a 17. b 18. c 19. a 20. b

21. d 22. d 23. c 24. c 25. a