Answer:
The genotypes of a person that can roll their tongue into a U-shape are "AA" or "Aa"
Explanation:
Let the trait of being "able to roll up the tongue into a U-shape" be represented by "A"
And the trait of being "not able to roll up the tongue into a U-shape" be represented by "a"
It is given that "A" is dominant over "a"
Hence, a person who is able to roll up the tongue into a U-shape can have either of the two type of genotype
a) Homozygous dominant genotype - AA
b) Heterozygous dominant genotype - Aa
Hence, the genotypes of a person that can roll their tongue into a U-shape are "AA" or "Aa"
