Question

1. the ability to roll your tongue (r) is a dominant trait. a woman who cannot roll her tongue (__) has a baby with a man who is homozygous dominant for this trait (__).

r = can roll tongue, r = cannot roll tongue
genotype phenotype
possibility 1: __ __
possibility 2: __ __
possibility 3: __ __
possibility 4: __ __

Explanation:

Step1: Determine the genotypes of parents

The woman cannot roll her tongue, so her genotype is \( rr \). The man is homozygous dominant, so his genotype is \( RR \).

Step2: Set up the Punnett square

The woman can only contribute \( r \) gametes. The man can only contribute \( R \) gametes.

$$\begin{array}{|c|c|} \hline R & R \\ \hline r & Rr \\ \hline r & Rr \\ \hline \end{array}$$

Step3: Analyze the genotypes and phenotypes

All offspring will have the genotype \( Rr \). Since \( R \) (tongue - rolling) is dominant, all offspring will have the phenotype of being able to roll their tongue.

Answer:

Genotype	Phenotype
\( Rr \)	Can roll tongue
\( Rr \)	Can roll tongue
\( Rr \)	Can roll tongue