(A) is false, but (R) is true.
Thomas Hunt Morgan carried out several dihybrid crosses in Drosophila melanogaster to study genes that were sex linked.
(a) Give four major reasons for using the tiny fruit flies by Morgan for his experiments.
(b) How did Morgan and his group explain the physical association of the two genes on a chromosome to the frequency of recombination between gene pairs on the same chromosome?
Answer either option-(A) or (B): (A)
OR (B)
Student to attempt either option (A) or (B):
(A) Write two features of an ideal contraceptive. Explain any one natural contraceptive method that makes the chances of conception almost nil.
OR
(B) Explain GIFT and ICSI.