Question

When predicting the phenotypic ratio of a crossing between two heterozygous fruit flies, the ratio was shown to be 9:3:3:1. what would the parental fruit fly's genotype have been if the resulting offspring had a 1:1:1:1 ratio instead?

When predicting the phenotypic ratio of a crossing between two heterozygous fruit flies, the ratio was shown to be 9:3:3.1. What would the parental fruit fly's genotype have been if the resulting offspring had a 1:1:1:1 ratio instead? Multiple Choice Ο O UB XLIBD Ο LIBb XLIbt Ο O Libb x 1181 Ο LLBB x bb Ο () ibb X LIBE

Answer 1

5th option is correct. It is a classic case of Dihybrid test cross.

In a dihybrid cross, if an individual is heterozygous for both Characters and is crossed with double recessive, a phenotypic ratio of 11:1:1 will be obtained. Let us see how : ССЫь x LLBь lb LB, LB, IB, lb LB Lb l B lb цвь Lebь въ и ьь db 11: 1: 1 Mence, option 5 is correct.