Cytogenetics Practice Test 6

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

2. In Drosophila Crossing over in paracentric region is lethal and leads to cross-over suppression. This leads to reduction in fertility.

3. Which of the following crosses can never result in a recessive phenotype?

4. Which of the following could be due to duplication?

5. If a true breeding tall pea plant is crossed with a true breeding short pea plant, what will be the phenotype of the F1 generation?

6. What is the probability of getting a Red flower by crossing a pink and white snapdragon flower?

7. In an organism you observe that phenotypes of the progeny are as – 315 H/H R/R, 108 H/-r/r, 101 h/h R/-, 32 h/h r/r. This shows_____

8. What are the results of pericentric inversion with single crossing over?

9. Which of the following is not true about conservative transposition?

10. How will you recognize a terminal deletion from breakage and loss at the terminal end?