Now you will perform a testcross for flies of a different mutant line. You have

Question

Now you will perform a testcross for flies of a different mutant line. You have established a true-breeding mutant line with curved wings (c), which is controlled by a single gene on chromosome 2, and purple eyes (pr), which is also controlled by a single gene on chromosome 2. You establish a parental cross between true-breeding males with curved wings and purple eyes and true-breeding wild-type females. You then mate the F1 females to males that are true-breeding for curved wings and purple eyes to generate the F2 generation. Map out this cross below, including expected genotypes and phenotypes of males and females at all stages of the experiment. Include the expected phenotypic ratio for the F2 generation.

Explanation / Answer

ccprpr ( mutant male with purple eyes and curved wings) x c+ c+ pr+ pr+ (wild type female with red eyes and straight wings)

Punnett diagram---cross 1

Punnett cross--2

phenotypic ratio after cross 2---- 3:1, genotypic ratio-1:2:1.

male x female cpr cpr c+ pr+ cc+prpr+(red eye, straight wings) cc+prpr+ (red eye, straight wings) c+ pr+ cc+prpr+(red eye, straight wings) cc+prpr+(red eye, straight wings)

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