Question

7.) is it possible for two parents with round jaws to have a child with a square jaw? why or why not?

Explanation:

Assume round jaw is dominant (R) and square jaw is recessive (r). If parents are heterozygous (Rr), they can pass on recessive alleles. Using Punnett square: Rr x Rr gives 25% chance of rr (square jaw).

Answer:

Yes. If parents are heterozygous for jaw shape (carry recessive allele for square jaw), through Mendelian inheritance (Punnett square analysis), there's a 25% chance of a child with a square jaw.