Cytogenetics Practice Test 6

1. Yellow colour of mouse is generated by _________ mutation.

2. During Strisinger’s model, what happens?

3. 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?

4. Deletions in chromosomes give the following data-

		Region of deletion  	Gene A activity
		A1			+++
		A2			++
		A3			+
		A4			+++
		A5			+++

Where is the gene located?

5. 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?

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

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

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

10. Crossing 2 Andulasian fowls you get 10 white fowl. What will be the expected number of Andulasian fowls as progeny?