Question

The pedigree chart below shows the individuals in a family who exhibit a certain trait. Based on the information in the chart, which of the following provides the best evidence that this is a recessive trait?



Couple 3-4 in the 2nd generation produced children who do not show the trait.

Couple 1-2 in the 2nd generation produced children who do show the trait.

Couple 3-4 in the 2nd generation produced children who are identical twins.

Couple 1-2 in the 1st generation produced children who do show the trait.

Answer 1

Think about this: a recessive trait won't show up if the other allele is wild type, so the fact that couple 3 / 4 have children that don't show the trait is the best evidence.

Answer 2

@ebaxter01 so its A or C