The drosophila alleles for black body (instead of the normal tan color, which is

Question

The drosophila alleles for black body (instead of the normal tan color, which is the wild type) and curved wings (instead of the wild- type straight wings) are both recessive and on chromosome 2 Gene "C" designates color, with alleles C representing the dominant tan allele and c representing the recessive black allele, while gene t "W" designates the wing shape gene with W being the dominant straight allele and w the recessive curved allele You need to discover how close together these two genes are on chromosome 2 You place one male from a pure breeding stock and one female from a pure breeding stock (these are the 'parental' or 'generation zero' (GO) flies) into vial 1 The offspring of this cross (cross 1) hatch in vial 1 These offspring (Generation 1, G1) are heterozygous for both genes You perform the cross from the above question and get 500 offspring in vial 2 (these are the G2 flies). Among these G2 flies. 65 have tan bodies and curved wings, 70 have black bodies and straight wings, 190 have black bodies and curved wings, and 175 have tan bodies and straight wings What are the genotypes of offspring with parental phenotypes? Select all that apply

Explanation / Answer

3). Given that the offspring of F1 generation are all heterozygous and their parents are from true breeding stock. The genotype of F1 offpsring is CcWw (it is already given that they are heterozygotes). The possible genotypes of their parents is, CCww and ccWW or CCWW and ccww.

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