Question

What must be true about the earlobes of Tom's parents?

What must be true about the earlobes of Alice's parents?

Which punnet square allows for the possibility that Tom and Alices children have attached earlobes?

what is the likelihood that the children in square 1 will have earlobes that are not attached?

What is the likelihood that the children in square 2 will have earlobes that are not attached?

What does probability have to do with heredity?

Answer 1

1. At least one of Tom's parents have attached earlobes: either EE or Ee
2. Each of Alice's parents carry at least one recessive copy of the the gene that determines earlobe attachment: they either have Ee or ee
3. Punnet square 2 because you need 2 copies of a recessive gene (in this case, ee) in order to have the recessive trait (attached earlobes)
4. 100% not attached earlobes
5. 50% not attached earlobes
6. probability aids in determining the likelihood that offspring will inherit specific genes from the parent.