Both parents can roll their tongue, yet their child cannot. What must the parent's

genotype be?

A. Parents must both be homozygous dominant

B. Parents must both be homozygous recessive

C. Parents must both be heterozygous

D. IDK

The answer is C Heterozygous

Explanation: the inability to roll your tongue is a recessive trait. Since both parents are heterozygous, they carry that recessive gene, so their child will have a 25% chance of having that recessive trait; and therefore, unable to roll their tongue.