In Drosophila,the Genes Crossveinless-C and Stubble Are Linked,about 7 Map

Multiple Choice

In Drosophila,the genes crossveinless-c and Stubble are linked,about 7 map units apart on chromosome 3.cv-c is a recessive mutant allele of crossveinless-c (cv-c⁺ is wild type) ,while Sb is a dominant mutant allele of Stubble (Sb⁺ is wild type) . A dihybrid female Drosophila with genotype cv-c Sb⁺/cv-c⁺Sb is testcrossed.The proportion of phenotypically wild-type individuals in the progeny of the testcross will be:

A) 0.035.
B) 0.070.
C) 0.350.
D) 0.465.
E) 0.930.