30 Jun Four eye-color mutants in Drosophila — apricot, brown, carnation, and purple —
Question Description
Cross Parents F1 Progeny
Female Male Female Male
A Apricot Red Red Apricot
B Brown Red Red Red
C Red Purple Red Red
D Red Apricot Red Red
E Carnation Red Red Carnation
F Purple Red Red Red
G Red Brown Red Red
H Red Carnation Red Red
Four eye-color mutants in Drosophila — apricot, brown, carnation, and purple — are inherited as recessive traits. Red is the dominant wild-type color of fruit-fly eyes. Eight crosses (A to H) are made between parents from pure-breeding lines. The results are shown in the table.
Part A
Which of these eye-color mutants are X-linked recessive?
Check all that apply.
Check all that apply.
brown
carnation
apricot
purple
Part B
Which of these eye-color mutants are autosomal recessive?
Check all that apply.
Check all that apply.
carnation
purple
brown
apricot
Part C
Predict F2 phenotype ratios of cross C.
Predict phenotype ratios of cross .
Females are 11 red. Males are 12 red, 12 purple.
Females are 34 red, 14 purple. Males are 34 red, 14 purple.
Females are 14 red, 34 purple. Males are 12 red, 12 purple.
None of the above.
Part D
Predict F2 phenotype ratios of cross B.
Predict phenotype ratios of cross .
Females are 12 red, 12 apricot. Males are 12 red, 12 apricot.
Females are 34 red, 14 brown. Males are 34 red, 14 brown.
Females are34 red, 14 apricot. Males are 34 red, 14apricot.
None of the above.
Part E
Predict F2 phenotype ratios of cross D.
Predict phenotype ratios of cross .
Females are 12 red, 12 apricot. Males are 12 red, 12 apricot.
Females are 12 red, 12 apricot. Males are 12 red, 12 apricot.
Females are 11 red. Males are 12 red, 12 apricot.
None of the above.
Part F
Predict F2 phenotype ratios of cross G.
Predict phenotype ratios of cross .
Females are11red. Males are 12 red, 12 apricot.
Females are 12 red, 12 apricot. Males are 12 red, 12 apricot.
Females are 34 red, 14 brown. Males are 34 red, 14 brown.
None of the above.
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