Identifying gene mutations

Reference no: EM1386256

The wild-type (normal) fruit fly, Drosophilia melanogaster, has straight wings and long bristles. Mutant strains have been isolated that have either curled wings or short bristles. The genes representing these two mutant traits are located on separate chromosomes. Carefully examine the data from the following five crosses shown below and answer the following questions.

	Progeny
Cross	Straight wings, long bristles	Straight wings, short bristles	Curled wings, long bristles	Curled wings, short bristles
Straight, short x straight, short	30	90	10	30
Straight, long x straight long	120	0	40	0
Curled, long x straight, short	40	10	40	40
Straight, short x straight, short	40	120	0	0
Curled, short x straight, short	20	60	20	60

a. Identify each mutation (curled wings and short bristles) as either dominant or recessive. In each case, indicate which crosses support your answer.

b. Assign gene symbols and, for each cross, determine the genotypes of the parents. Remember that a superscript + is used to symbolize the wildtype mutation in Drosophilia.

Reference no: EM1386256

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