SAT® Subject Test in Biology

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Difficult

Dihybrid Cross

SATBIO-YEIW3Y

In Drosophila, normal wings (+) are dominant to vestigial wings (vg) and the presence of eyes (+) is dominant to being eyeless (ey). The offspring of a cross between two unknown parents yielded the following results: 299 normal winged, normal eyed flies; 106 normal winged, eyeless flies; 99 vestigial winged, normal eyed flies, and 33 vestigial winged, eyeless flies.

What genotypes did the parent generation most likely possess?

A

+vg/+ey x +vg/+ey

B

vgvg/++ x ++/eyey

C

++/++ x vgvg/++

D

vgvg/eyey x +vg/eyey

E

+vg/+ey x vgvg/eyey