Cytogenetics Mock Test 6

10%

Question 1 of 10

1. If an H is for tall trait which is dominant and h is the recessive trait for short, which of the following cross will result in 1:1 tall: short progeny?

hh X hh

Hh X Hh

HH X hh

Hh X hh

Question 1 of 10

Question 2 of 10

2. There are two chromosomes 1- A—B—C—D—E and 2- F—G—H— I, if A—B—C and F—G undergo reciprocal translocation what will not be true?

The 1 will then pair with both 1’ and 2’

2nd chromosome will become longer

Pairing will be between same gene loci only

New sequence at 1 will be C—D—E—F—G

Question 2 of 10

Question 3 of 10

3. Which of the following is a test cross?

Hh X hh

Hh X HH

HH X HH

Hh X Hh

Question 3 of 10

Question 4 of 10

4. If you cross a white eyed female drosophila with a red eyed male drosophila, what will be the colour of eyes for their male and female offspring?

Red eyed daughter and white eyed son

Both white eyed

Red eyed son and white eyed daughter

Both red eyed

Question 4 of 10

Question 5 of 10

5. If a part of the chromosome was transferred to a non-homologous chromosome say 1 to 1’. Then which of the following is not true?

The pairing in meiosis will be affected

In most of the cases, the resultant gamete will be non-viable

The pairing will be between 4 homologous chromosomes

The chromosome will be torn apart while segregation

Question 5 of 10

Question 6 of 10

6. The cross between a black and white fowl will give _______

Gray

Black

White

Andulasian

Question 6 of 10

Question 7 of 10

7. Deletion of a region led to over expression of a gene X. What do you conclude from this observation?

Part of gene X is mutated

Regulator of gene X is deleted

Promoter of gene X is deleted

No effect on gene X or its regulators

Question 7 of 10

Question 8 of 10

8. In drosophila male there is no cross over suppression due to pericentric inversion as___________

They never recombine

They always have double cross over

They don’t undergo meiosis

They have only one set of chromosome

Question 8 of 10

Question 9 of 10

9. You hybridize two cells one of which carries a deletion mutation on chromosome 1. What will you expect to observe?

Buckling of chromatin of 2^nd cell

Twisting and loop formation between the two chromatins

No observable difference

Buckling of chromatin of 1^st cell

Question 9 of 10

Question 10 of 10

10. In a dihybrid cross which of the following will be of the least occurrence?

All will occur equally

Heterozygous dominant

Pure breeding

Homozygous recessive

Question 10 of 10