25 Jun Male fruit flies with black body color and tubby body shape
Question
1. Male fruit flies with black body color and tubby body shape are mated to wild type females (normal gray body color and normal body shape). The black body color and tubby shape mutations are both recessive. The body color gene is on located one the second chromosome while the body shape gene is located on the third chromosome.
a. Assign letter designations to each gene and the alleles. Write out the cross and the expected F1 offspring.
b. If the F1 hybrid female fruit flies are mated to males with black body color and tubby body shape, what phenotypes and ratios are expected in the F2 generation? (Hint: this is a test cross.)
2. The hairy (h) and the scarlet (st) genes of Drosophila are linked. Both are located on chromosome 3 at map positions 26.0 cM and 44.0 cM, respectively. The recessive allele (h) of the hairy gene causes extra hairs to form on the wings. The recessive allele (st) of the scarlet gene produces a brighter red eye color than the brick red color of wild type flies. Homozygous male fruit flies with “hairy” wings and wild type eye color are mated to homozygous females with wild type wings and “scarlet” eyes.
a. Draw out the cross described above. Illustrate the pair of third chromosomes, including the hairy (h) and scarlet (st) alleles, of the male and of female flies.
b. Draw the chromosomes and alleles for the F1 offspring of the cross in 2a.
c. If the F1 hybrid female fruit flies are mated to tester males with hairy wings and scarlet eye color, what phenotypes are expected in the F2 generation? Predict the % of each oft he different phenotypes.
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