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SAT® Subject Test in Biology

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Phenotypic Ratio

SATBIO-FXNNTS

Lubber grasshoppers are a large grasshopper characterized by a black body with red and yellow stripes. Red stripes are produced when the RR genotype is present, yellow stripes are produced when the rr genotype is present, and both red and yellow stripes are produced when the Rr genotype is present.

If two red and yellow striped lubber grasshoppers produce offspring, what would the expected phenotypic ratio of the offspring be?

A

3:1

B

4:0

C

1:2:1

D

2:2:0

E

3:0:1