Question

what are the most likely genotypes of two parents who are not albino and who have an albino child?
○ aa and aa
○ aa and aa
○ aa and aa
○ aa and aa
○ aa and aa

Explanation:

Step1: Determine the inheritance pattern

Albinism is a recessive trait. Let \(A\) represent the dominant allele (non - albino) and \(a\) represent the recessive allele (albino). An albino individual has the genotype \(aa\).

Step2: Analyze each option

• Option 1 (\(aa\) and \(AA\)):

The cross \(AA\times aa\) gives \(Aa\) offspring. All offspring will be non - albino (\(Aa\)).

• Option 2 (\(aa\) and \(aa\)):

Both parents are albino (\(aa\)). But the problem states that parents are not albino.

• Option 3 (\(AA\) and \(AA\)):

The cross \(AA\times AA\) gives \(AA\) offspring. All offspring will be non - albino (\(AA\)).

• Option 4 (\(AA\) and \(aa\)):

As in option 1, \(AA\times aa\) gives \(Aa\) offspring. All offspring will be non - albino (\(Aa\)).

• Option 5 (\(Aa\) and \(Aa\)):

Using the Punnett square for \(Aa\times Aa\):

Gametes of Parent 1	Gametes of Parent 2
\(A\)	\(AA\) (non - albino)	\(Aa\) (non - albino)
\(a\)	\(Aa\) (non - albino)	\(aa\) (albino)

The probability of getting an \(aa\) (albino) child is \(\frac{1}{4}\), and the parents (\(Aa\)) are non - albino. So, the most likely genotypes of the parents are \(Aa\) and \(Aa\).

Answer:

Aa and Aa