Punnett Squares: Dihybrid Crosses The lubber grasshopper is a very large grassho

Question

Punnett Squares: Dihybrid Crosses

The lubber grasshopper is a very large grasshopper, and is black with red, orange, or yellow stripes. Orange is the incompletely dominant state. Assume that red stripes are expressed from the homozygous RR genotype, yellow stripes from the homozygous rr genotype, and orange from the heterozygous genotype. Antenna length is determined by another gene, with A dominant for long antennae over a for short antennae. What phenotypes would you expect if you cross an RRAa grasshopper with an rrAa grasshopper?

a) 1/4 would have red stripes with long antennae, 1/4 would have orange stripes with long antennae, 1/4 would have orange stripes with short antennae, and 1/4 would have yellow stripes with short antennae.

b) 1/2 would have orange stripes with long antennae, 1/4 would have yellow stripes with long antennae, and 1/4 would have yellow stripes with short antennae.

c) 1/2 would have red stripes with long antennae, 1/4 would have yellow stripes with long antennae, and 1/4 would have yellow stripes with short antennae.

d) 1/2 would have orange stripes with long antennae and 1/2 would have orange stripes with short antennae.

e) 1/2 would have red stripes with long antennae and 1/2 would have orange stripes with short antennae.

Explanation / Answer

The correct option is (d) 1/2 would have orange stripes with long antennae and 1/2 would have orange stripes with short antennae.

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