115. In a linear chromosome map, distance between 4-Loci is as follow:- a-b = 10%, a-d=3%, b-c=4% and a-c = 6% the COV (cross over value) between c & d is:- (1) 3% (3) 3% or 9% (2) 9% (4) 4% or 12% 116. Morgan works with the tiny fruit flies, Drosophila Melanogaster because :- (1) They could be grown on simple synthetic medium in the laboratory (2) They complete their life cycle in about two 2 weeks (3) They have many types of hereditary variations that can be seen with low power microsope. (4) All of the above 117. The test cross of an F, individual produced the following offsprings- ++/ab - 10 ab/ab - 10 +a/ab - 40 +b/ab - 40 Based on this data find out distance between a and b :- (1) 20(Cis) (2) 20(Trans) (3) 10(Cis) (4) 10(Trans)