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

question 6

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.

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