Question

3. Jane has noticed that both her parents have free earlobes and she has an attached earlobe.

She learns that she is homozygous recessive (aa) for her attached earlobes. What are the
genotypes of her parents?

Answer 1

The genotypes of her parents are (Aa) respectively.

Step-by-step explanation:

Both of her parents are Heterozygous meaning that they both have two different alleles.

Jane had a 25% chance to get an attached earlobe and a 75% to get free earlobes.

If one of her parents had a homozygous dominant (AA) than Jane would had a 0% chance to get an attached earlobe.