Shown (the picture) is a partial gene map for Drosophila melanogaster. In Drosophila, vermillion eyes are recessive (v) to red eyes (V) and the gene resides on chromosome 1; dumpy wings (d) are recessive to normal wings (D); and speckled body (s) is recessive to normal body (S). The dumpy wing gene and the speckle body gene are linked on chromosome 2 and have 7 map units separating them. Assume that chromosome 1 and 2 are autosomal chromosomes and that there are no known interactions between the genes. In an experiment, an undergraduate student crossed pure breeding males that have red eyes, normal wings, and normal body with pure breeding females who have vermillion eyes, dumpy wings, and speckle body to obtain an F1. Using the Drosophila gene map, answer the following questions: a. What fraction of the F1 gametes will contain the alleles for red eyes, normal wings and speckle body? b. In a cross between an F1 flies and a tester, what fraction of the offspring do you expect to have vermillion eyes, dumpy wings, and speckle body phenotype ? c. In an F1 X F1 cross, what fraction of the offspring will have the dS/Ds genotype ? d. In an F1 X F1 cross, what fraction of offspring will have the normal wings ?
Shown (the picture) is a partial gene map for Drosophila melanogaster. In Drosophila, vermillion eyes are recessive (v) to red eyes (V) and the gene resides on chromosome 1; dumpy wings (d) are recessive to normal wings (D); and speckled body (s) is recessive to normal body (S). The dumpy wing gene and the speckle body gene are linked on chromosome 2 and have 7 map units separating them. Assume that chromosome 1 and 2 are autosomal chromosomes and that there are no known interactions between the genes.
In an experiment, an undergraduate student crossed pure breeding males that have red eyes, normal wings, and normal body with pure breeding females who have vermillion eyes, dumpy wings, and speckle body to obtain an F1. Using the Drosophila gene map, answer the following questions:
a. What fraction of the F1 gametes will contain the alleles for red eyes, normal wings and speckle body?
b. In a cross between an F1 flies and a tester, what fraction of the offspring do you expect to have vermillion eyes, dumpy wings, and speckle body
c. In an F1 X F1 cross, what fraction of the offspring will have the dS/Ds genotype ?
d. In an F1 X F1 cross, what fraction of offspring will have the normal wings ?
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