Genetics problem please help the whole homework assignment is due tomorrow at 4:10 pm

Question

Packrats exhibit many interesting behaviors. Let's say that the trait of bringing home fun shiny objects (controlled by the allele H) is dominant to the trait of bringing home dull boring objects (controlled by the allele h). The shiny object phenotype has a penetrance of 80%. Suppose two heterozygous individuals are crossed, and 30 offspring are produced.
(A) How many should like shiny objects?
(B) If there was a difference in expressivity, how would this affect the phenotype? Would it change your answer to (A)?

Answer 1

I am not familiar with the term penetrance. But to find part a, perform a cross between two Hh individuals and it should come out to like 75% like shiny objects.