Question

analyze the table below and answer the question that follows.
if the ability to roll ones tongue is dominant (r) and the inability to roll ones tongue is recessive (r), what are the possible genotypes for someone who can roll their tongue?
only rr
rr and rr
rr and rr
only rr

Explanation:

Step1: Understand dominant and recessive traits

In genetics, a dominant trait (R) shows its effect even when a recessive allele (r) is present.

Step2: Analyze genotypes

• RR: Has two dominant alleles. Will show the dominant trait (tongue - rolling).
• Rr: Has one dominant allele. Since R is dominant, will show the dominant trait (tongue - rolling).
• rr: Has two recessive alleles. Will show the recessive trait (no tongue - rolling).

So, the possible genotypes for someone who can roll their tongue are RR and Rr.

Answer:

RR and Rr