A scientist is studying fruit fly wings. Straight wings are dominant, and curly wings are recessive. Which statement correctly describes the cap f sub 1 generation if a straight-winged parent is crossed with a curly-winged parent and if both parents are true breeding?
Answer
A
The offspring will have one allele for straight wings and one allele for curly wings.
B
The offspring will have only one kind of allele for the gene that determines wing type.
C
The offspring will have two genes for straight wings.
D
The offspring will produce only gametes that have genes for curly wings.
Explanation
Because both parents are true breeding, the straight-winged parent has two dominant alleles (SS) and the curly-winged parent has two recessive alleles (ss). Each offspring gets one allele from each parent, so the F1 offspring have one straight-wing allele and one curly-wing allele; choice D is correct.
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