1

The following pedigree shows the trait of individuals who cannot
taste the chemical compound phenylthiocarbamide (PTC). Shaded
individuals in the pedigree cannot taste PTC, and this autosomal
trait is recessive to the ability to taste the compound.

In the pedigree below, if individuals IV-4 and IV-5 married,
what phenotype would their children be

All children would be tasters.

1/2 of children would be tasters, 1/2 non-tasters.

3/4 of the children would be tasters, 1/4 would be
non-tasters.

All the girls would be tasters, all the boys would be
non-tasters.

All the boys would be tasters, all the girls would be
non-tasters.

DNA is a double helix, made up of four different nucleotide
bases.

The molar amount of A is always equal to the molar amount of
T.

A dead cellular extract is able to provide genetic
information.

The DNA backbone is made up of alternating sugars and
phosphates.

1′

2′

3′

4′

5′