Cytogenetics Mock Test 9

10%

Question 1 of 10

1. In Angelman syndrome we don’t see___________

Overeating urge

Unprovoked laughter

Microcephaly

Speech impairment

Question 1 of 10

Question 2 of 10

2. Gene interaction always modifies the normal Mendalian ratio.

False

True

Question 2 of 10

Question 3 of 10

3. In mice H19 and Igf2 genes are controlled by the same enhancer. Which of the following is true?

Both the genes show paternal imprinting

In one chromosome both the genes are expressed and in other they are not

Igf2 shows paternal imprinting, H19 shows maternal imprinting

The enhancer enhances both the gene on promoter binding

Question 3 of 10

Question 4 of 10

4. If a Drosophila is having XXY sex chromosomal combination with one X bearing white allele for eye colour and another X having eosin allele for eye colour, what would be its phenotype?

White eyes

This is a lethal combination

Red eyes

Eosin eyes

Question 4 of 10

Question 5 of 10

5. The primary transcript is ______________

45S

52S

17S

32S

Question 5 of 10

Question 6 of 10

6. Lethal alleles can only be recessive.

True

False

Question 6 of 10

Question 7 of 10

7. tRNA constitutes ___________ % of all RNA.

Question 7 of 10

Question 8 of 10

8. Dominant epistasis ratio with A as epistatic gene 12:3:1 corresponds to ________________

A/A B/-: A/- B/-: a/a b/b

A/- -/- : a/a B/-: a/a b/b

a/a B/- : a/a b/b : a/a b/-

A/- B/- : A/- b/b : a/a B/-

Question 8 of 10

Question 9 of 10

9. Flower colour in sweet pea shows duplicate epistasis, if purple colour is dominant what is the F2 ratio?

9:3:4

3:1

15:1

9:7

Question 9 of 10

Question 10 of 10

10. If there are multiple alleles for a gene which of the following is true?

Among the multiple copies resent only the most dominant one is expressed

Only one allele is dominant rest all are recessive

All the alleles same expressed at the same time

Only two alleles are present at a time

Question 10 of 10