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A man of 'A' bood group marries a woman ...

A man of 'A' bood group marries a woman of 'AB' bood group .Which types of progeny would indicate that man is heterozyguos?

A

O

B

B

C

A

D

AB

Text Solution

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The correct Answer is:
To determine which types of progeny would indicate that a man with 'A' blood group is heterozygous when he marries a woman with 'AB' blood group, we can follow these steps: ### Step 1: Understand Blood Group Genetics Blood groups are determined by the presence of specific antigens on the surface of red blood cells. The ABO blood group system includes four main types: A, B, AB, and O. The genotypes for these blood groups are as follows: - Blood group A can be either genotype \( I^A I^A \) (homozygous) or \( I^A i^O \) (heterozygous). - Blood group B can be either genotype \( I^B I^B \) (homozygous) or \( I^B i^O \) (heterozygous). - Blood group AB has the genotype \( I^A I^B \) (co-dominance). - Blood group O has the genotype \( i^O i^O \) (homozygous). ### Step 2: Identify the Genotypes of the Parents In this case: - The man has blood group A, which means his genotype could be either \( I^A I^A \) or \( I^A i^O \). - The woman has blood group AB, which means her genotype is \( I^A I^B \). ### Step 3: Determine Possible Progeny To find out the possible blood groups of their children, we can set up a Punnett square for the two possible genotypes of the father: 1. **If the father is homozygous \( I^A I^A \)**: - Possible combinations with the mother \( I^A I^B \): - \( I^A I^A \) (Blood group A) - \( I^A I^B \) (Blood group AB) In this case, the progeny can only be blood group A or AB. 2. **If the father is heterozygous \( I^A i^O \)**: - Possible combinations with the mother \( I^A I^B \): - \( I^A I^A \) (Blood group A) - \( I^A I^B \) (Blood group AB) - \( I^B i^O \) (Blood group B) In this case, the progeny can be blood group A, AB, or B. ### Step 4: Conclusion To determine that the man is heterozygous, the presence of a child with blood group B is essential. This is because blood group B can only arise if the father carries the \( i^O \) allele, indicating he is heterozygous \( I^A i^O \). ### Final Answer The type of progeny that would indicate that the man is heterozygous is a child with blood group B. ---
To determine which types of progeny would indicate that a man with 'A' blood group is heterozygous when he marries a woman with 'AB' blood group, we can follow these steps: ### Step 1: Understand Blood Group Genetics Blood groups are determined by the presence of specific antigens on the surface of red blood cells. The ABO blood group system includes four main types: A, B, AB, and O. The genotypes for these blood groups are as follows: - Blood group A can be either genotype \( I^A I^A \) (homozygous) or \( I^A i^O \) (heterozygous). - Blood group B can be either genotype \( I^B I^B \) (homozygous) or \( I^B i^O \) (heterozygous). - Blood group AB has the genotype \( I^A I^B \) (co-dominance). - Blood group O has the genotype \( i^O i^O \) (homozygous). ...
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