Question

1. can you curl your tongue? tongue - curling in humans (t) is a dominant genetic trait. derek can curl his tongue but his wife, ashley, cannot. all nine of their children can curl their tongues. complete the punnett square based on the genotypes they most likely have.

derek
ashley
phenotype probability (%)
tongue - curling:
cannot curl tongue:

Explanation:

Step1: Determine Ashley's genotype

Since tongue - curling (T) is dominant and Ashley cannot curl her tongue, her genotype must be \( tt \) (homozygous recessive).

Step2: Determine Derek's genotype

All of their children can curl their tongues. If Derek had a heterozygous genotype \( Tt \), there would be a \( 50\%\) chance of having a child with genotype \( tt \) (who cannot curl the tongue). But since all children can curl the tongue, Derek's genotype is most likely \( TT \) (homozygous dominant).

Step3: Create the Punnett square

Derek (\( TT \)) can only contribute \( T \) gametes. Ashley (\( tt \)) can only contribute \( t \) gametes.

	\( T \)	\( T \)
\( t \)	\( Tt \)	\( Tt \)

Step4: Calculate probabilities

All offspring have the genotype \( Tt \). Since \( T \) is dominant, the probability of tongue - curling phenotype is \( 100\%\) and the probability of not being able to curl the tongue (\( tt \)) is \( 0\%\).

Answer:

Tongue - curling: \( 100\%\)
Cannot Curl Tongue: \( 0\%\)