What phenotypic progeny classes do you expect and at what frequencies? Genetics hw.

[xohmymochax]

You are studying a gene that controls ossicone (horn) length in giraffes. The wild-type long-ossicone allele (L) is dominant to the mutant short-ossicone (l) allele. However the L allele is only 60% penetrant. You cross two heterozygous giraffes. What phenotypic progeny classes do you expect and at what frequencies (assume the penetrance of L applies equally to both homozygotes and heterozygotes).