GENES AND CHROMOSOMES

GENES AND CHROMOSOMES

1. Concept of gene was given by

a. Sutton b. Boveri c. Sutton and Boveri d. Morgan

2. A gene with multiple phenotypic effect is called

a. Pleiotropic gene b. Polygene c. Multiple allele d. Dominant

3. When a hereditary trait is controlled by more than one non allelic genes, it is called

a. Polygenic trait b. Continuous metric trait c. Quantitative trait d. All of the above

4. Balbiani rings are found in

Polytene chromosomes b. Diplotene chromosomes c. Z - DNA d. B - DNA

5. In plants maximum number of chromosomes (2n = 1262) are found in

a. Ophioglossum reticulatum b. Haplopappus gracilis c. saccharum officinarum

d. None of the above

6. Exchange of chromosome segments between maternal and paternal chromatids during

meiosis is called

a. Linkage b. exchange c. Crossing over d. Replacement

7. Crossing over brings about

a. Recombination of genes b. No significant change c. Sturdy offspring

d.Cytoplasmic reorganisation

8. Gynandromorphs appear in Drosophila because of

a. Loss of X - chromosome b. Autosomal loss c. Mutation

d. Gain of Y - Chromosome

9. XX -XO sex chromosome complement is found in

a. Honey Bee b. Birds c. Gorilla d. Cockroach

10. A lone is a collection of genetically

a. Different individuals produced by sexual reproduction

b. Different individuals produced by vegetative reproduction

c. Identical individuals produced by sexual reproduction

d. Identical individuals produced by vegetative propagation

11. Criss cross inheritance was discovered by:

a. Morgan b. Morgan and Bridges c. Muller d. Bridges

12. A man carrying a sex linked gene on his Y Chromosome will transmit this gene to

a. 1/2 his male offspring b. 1/2 his female offspring c. All his female offspring

d. All his male offspring

13. An individual with half body male and half body female is known as

a. Sterile b. Free martin c. Inter sex d. gynandromorpph

14. The pattern of inheritance of white eye colour in Drosophila shows that the gene is

a. Located on the X - Chromosome b. Located on the Y - Chromosome

c. Located on an autosome d. Sex influenced

15. Sex-linked characters are transmitted through

a. Y - Chromosome s of male b. X - Chromosome of female only

c. X - Chromosomes of of both male & female d. X - Chromosome of male only

16. Ram is colour blind but his wife is 100% normal. What is the chance his son will inherit this

disease from his father

a. 1% b. 25% c. 50% d. 100%

17. Colour blindness is caused by a single

a. Dominant autosomal gene in woman b. Autosomal recessive gene is woman

c. Recessive sex chromosomal gene in man d. Recessive sex chromosomal gene in man

18. Chromosome pattern of Turner’s syndrome is

a. 2A + XXY b. 2A + XXX c. 2A + X d. 2A + Y

19. Down’s syndrome or Mongoloid idiocy (Mongolism) is due to

a. Trisomy of X chromosome b. Trisomy of 21st chromosome

c. Nullisomy of a chromosome d. Monosomy of an autosome

20. Extra chromosomal bodies in paramecium are

a. Plasmids b. Lambda particles c. Kappa particles d. Episomes


ANSWERS

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

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