The wild-type (normal) fruit fly, Drosophila 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 (running across both columns). (a) Identify each mutation 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.

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The wild-type (normal) fruit fly, Drosophila 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 (running across both columns).

(a) Identify each mutation 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.

Progeny
straight wings,
long bristles
straight wings,
short bristles
curled wings,
long bristles
curled wings,
short bristles
Cross
1. straight, short X straight, short
30
90
10
30
2. straight, long × straight, long
120
40
3. curled, long X straight, short
40
40
40
40
4. straight, short X straight, short
40
120
5. curled, short X straight, short
60
20
60
20
Transcribed Image Text:Progeny straight wings, long bristles straight wings, short bristles curled wings, long bristles curled wings, short bristles Cross 1. straight, short X straight, short 30 90 10 30 2. straight, long × straight, long 120 40 3. curled, long X straight, short 40 40 40 40 4. straight, short X straight, short 40 120 5. curled, short X straight, short 60 20 60 20
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