Short hair (L) is dominant to long hair (l) . Suppose a short-haired animal of unknown genotype is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring. What do these results indicate?

A) The short-haired animal was homozygous.
B) The short-haired animal was heterozygous.
C) The long-haired animal was heterozygous.
D) Both the long-haired and short haired animals were heterozygous.
E) None of these can be determined with these two offspring.

Question

Wyatt Kosicki · Accepted Answer

Final Answer : B, Explanation :  The fact that the cross produced both long-haired and short-haired offspring indicates that the short-haired animal must have been heterozygous (Ll) and the long-haired animal must have been homozygous recessive (ll). The offspring inherited one copy of the recessive allele (l) from the long-haired parent and one copy of either the dominant (L) or recessive (l) allele from the short-haired parent. Therefore, the short-haired parent must have had one dominant allele (L) and one recessive allele (l).

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