Question

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

(a) True

(b) False

This question was addressed to me in an interview for job.

My enquiry is from Chromosomal Abnormality : Inversion in chapter Chromosomal Basis of Inheritance of Cytogenetics

Answer 1

The correct answer is (b) False

To explain: In Drosophila only females undergo recombination. In the case of egg formation out of the 4 meiotic products, only one forms the egg and the 3 other forms the polar body. Thus, the cross over suppressed gamete simply forms the polar body so doesn’t affect fertility.