Question

Coral was born with blue eyes, but her mother and father both have brown eyes.

A) This means that: both of Coral's parents had a recessive blue allele.
b) neither of Coral's parents had a recessive blue allele.
C)Coral must be adopted.
D) both of Coral's parents had two dominant brown-eye alleles.

Answer 1

A) This means that: both of Coral's parents had a recessive blue allele.

Step-by-step explanation:

Eye color is determined by multiple genes, but for simplicity, let's consider a single gene with two alleles - brown (dominant) and blue (recessive).

Coral's parents both have brown eyes, so they must each have at least one brown allele. However, for Coral to be born with blue eyes when both parents have brown eyes, this means:

• Both parents must carry a recessive blue allele, even though they have brown eyes themselves. Since blue is recessive, it requires two copies (one from each parent) in order to be expressed.
• Coral inherited a blue allele from each parent, giving her two copies of the recessive blue allele and therefore blue eyes.

So in summary, for Coral to be born with blue eyes when both parents have brown eyes, it means that both parents must have at least one recessive blue allele, even though it is masked by their dominant brown allele. This allows them to pass on a blue allele to Coral.

Options B, C and D can be ruled out because there is no indication that Coral's parents lack a recessive blue allele (B), that Coral is adopted (C), or that Coral's parents only have dominant brown alleles (D).

Answer 2

Answer:A

Explanat

Both had a recessive blue allele in order for Coral to have blue eyes.