Questions 1-8 are related. The drosophila alleles for black body (instead of the

Question

Questions 1-8 are related. 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 “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’ (G0) 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.

5. Two true breeding parents (G0) gave rise to the doubly heterozygous (G1) flies in vial 1. What were the genotypes of these parents?

ccww

6. What is the percent of recombinants for these two genes?

100%

7. If the two genes were actually on different chromosomes, what phenotypic distribution would you expect in the G2 flies (instead of 65 tan curved, 70 black straight, 190 black curved, and 175 tan straight)?

None of the above are correct

8. If the two genes were actually on different chromosomes and you crossed the heterozygous flies to each other (did a self cross) what phenotypic distribution would you expect from the offspring?

None of the above are correct

Explanation / Answer

5. Answer

The genotypes of these parents would be CCWW, CCww, ccWW, ccww

6. Answer

Recombination is 100 %

7 answer

Option 1 would be answer

For 8 none of them are correct.

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