Question

critical thinking
9 predict the possible blood genotypes of
a child, using the table below, if one parent is
type o and the other parent is type a.

phenotype	genotype
blood type a	$i^a i^a$ or $i^a i$

Explanation:

Step1: Analyze Parent 1 (Type O) Genotype

Parent with blood type O has genotype \( ii \), so it can only contribute \( i \) allele.

Step2: Analyze Parent 2 (Type A) Genotypes

Parent with blood type A can have two genotypes: \( I^AI^A \) or \( I^Ai \).

Case 1: Parent 2 is \( I^AI^A \)

• Parent 1 (O) contributes \( i \).
• Parent 2 (A, \( I^AI^A \)) contributes \( I^A \).
• Offspring genotype: \( I^Ai \).

Case 2: Parent 2 is \( I^Ai \)

• Parent 1 (O) contributes \( i \).
• Parent 2 (A, \( I^Ai \)) can contribute \( I^A \) or \( i \).
• If Parent 2 contributes \( I^A \): Offspring genotype \( I^Ai \).
• If Parent 2 contributes \( i \): Offspring genotype \( ii \).

Step3: Combine Possible Genotypes

From both cases, possible genotypes are \( I^Ai \) (when Parent 2 contributes \( I^A \)) and \( ii \) (only when Parent 2 is \( I^Ai \) and contributes \( i \)).

Answer:

The possible blood genotypes of the child are \( I^Ai \) and \( ii \) (if the type A parent has genotype \( I^Ai \)) or only \( I^Ai \) (if the type A parent has genotype \( I^AI^A \)). In general, considering both possible genotypes of the type A parent, the possible genotypes are \( I^Ai \) and \( ii \) (with \( ii \) being possible only when the type A parent is heterozygous \( I^Ai \)).