A Drosophila recessive mutation called singed (s) causes the

A Drosophila recessive mutation called singed (s) causes the bristles to be bent and misshapen rathe… Show more A Drosophila recessive mutation called singed (s) causes the bristles to be bent and misshapen rather than wild type straight (s+). A mutation called purple (p) is another recessive mutation that causes the fly’s eyes to be purple in color instead of the normal red (p+) In the P generation, true breeding flies for singed and purple were crossed with true breeding flies that had normal bristles and red eyes. The F1 were used in reciprocal crosses to produce the F2, and the following results were obtained: Cross 1: P male, singed bristles, purple eyes x female, normal bristles, red eyes F1 : 420 female, normal bristles, red eyes 426 male, normal bristles, red eyes F2- 337 female, normal bristles, red eyes 113 female, normal bristles, purple eyes 168 male, normal bristles, red eyes 170 male, singed bristles, red eyes 56 male, normal bristles, purple eyes 58 male, singed bristles, purple eyes Cross 2: P female, singed bristles, purple eyes x male, normal bristles, red eyes F1 : 504 female, normal bristles, red eyes 498 male, singed bristles, red eyes F2: 227 female, normal bristles, red eyes 223 female, singed bristles, red eyes 225 male, normal bristles, red eyes 225 male, singed bristles, red eyes 78 female, normal bristles, purple eyes 76 female, singed bristles, purple eyes 74 male, normal bristles, purple eyes 72 male, singed bristles, purple eyes a) Which of the two genes, of singed or purple is X-linked? Explain your reasoning. b) Indicate genotypes of parents and F1 for both crosses using provided symbols. Remember that all the parents are true breeding Cross 1: P male, singed bristles, purple eyes : ______________________________ P female, normal bristles, red eyes: ________________________________ F1 : female, normal bristles, red eyes: _____________________________ F1 male, normal bristles, red eyes: _________________________________ Cross 2: P female, singed bristles, purple eyes: ______________________________ P male, normal bristles, red eyes: _______________________________ F1 :female, normal bristles, red eyes: _________________________________ F1 male, singed bristles, red eyes: _________________________________ • Show less

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