Cytogenetics Mock Test 6

10%

Question 1 of 10

1. The expected phenotypic ratio obtained by crossing the F1 generation in dihybrid cross would be?

9:3:3:1

1:2:1:2:4:2:1:2:1

1:2:1

3:1

Question 1 of 10

Question 2 of 10

2. The appearance of a recessive phenotype due to deletion of dominant gene is called_______________

Pseudo dominance

Imperfect dominance

Co-dominance

Hemi-dominance

Question 2 of 10

Question 3 of 10

3. What is the probability of getting a recessive phenotype for all three gene locus for the cross Aa Bb Cc X aa Bb cc?

1/4

1/16

1/2

1/8

Question 3 of 10

Question 4 of 10

4. Which of the following will be pure breeding for only one character?

HH RR

hh rr

HH Rr

Hh Rr

Question 4 of 10

Question 5 of 10

5. Transposition doesn’t require much sequence homology between two genetic molecules, based on this hey can help in _____________

Homologous DSB repair

Non-homologous end joining

Site-specific recombination

Homologous recombination

Question 5 of 10

Question 6 of 10

6. What percentage of the human genome is transposition related?

50%

80%

10%

Question 6 of 10

Question 7 of 10

7. Long pericentric inversions generally don’t act as cross over suppressors. Why?

Two events of crossing over take place

Cross over product in this is viable

Long stretches of DNA recombination not recognized

Mechanism is different for short and long inversions

Question 7 of 10

Question 8 of 10

8. If the genes are located in a chromosome as A---B---C---D---E---O----T. Which of the gene pairs will have least probability of being inherited together?

O and T

C and D

A and T

A and B

Question 8 of 10

Question 9 of 10

9. Which of the following is a result of reciprocal translocation?

Thalassemia

Trychothiodystrophy

Burkitt’s lymphpma

Cockyne’s syndrome

Question 9 of 10

Question 10 of 10

10. Which of the following is not a possible cause of lethality of individuals carrying a deletion mutation?

Genes that are not haplo sufficient doesn’t produce adequate gene product

Unmasking of lethal recessive alleles

Genomic imbalance

Lack of diversity

Question 10 of 10