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Two different groups of imaginary schmoos live in geographically separated locations and rarely interbreed. On one occasion, a big-footed white schmoo does mate with a small-footed brown schmoo. Three offspring result: one big-footed brown schmoo and two small-footed brown schmoos.
-Which statement about the inheritance of color in schmoos is most likely to be correct?
A) Brown is dominant to white.
B) White is dominant to brown.
C) White and brown are codominant.
D) Both a and c
E) This cannot be answered without more information.

Question

Quizplus · Accepted Answer

The offspring include both big-footed and small-footed schmoos, indicating that foot size is inherited independently of color. Since one of the offspring is brown, it must have received a brown allele from its brown parent. If brown was recessive, then both parents would have to be homozygous for the brown allele, and all the offspring would have to be brown. Therefore, brown must be dominant to white.

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