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NEET BIOLOGYMedium

The genotypes of a husband and wife are IAIB and IAi respectively. Among the blood types of their children, how many different genotypes and phenotypes are possible?

A

3 genotypes; 4 phenotypes

B

4 genotypes; 3 phenotypes

C

4 genotypes; 4 phenotypes

D

3 genotypes; 3 phenotypes

Step-by-Step Solution

To determine the number of genotypes and phenotypes, we perform a cross between the husband () and the wife ().

The gametes produced are:

  • Husband: and
  • Wife: and

The possible offspring genotypes from the cross () are:

  1. (Phenotype: Blood Group A)
  2. (Phenotype: Blood Group A)
  3. (Phenotype: Blood Group AB)
  4. (Phenotype: Blood Group B)

Analysis:

  • Genotypes: There are 4 distinct genotypes ().
  • Phenotypes: There are 3 distinct phenotypes (Blood Group A, Blood Group AB, and Blood Group B). Note that both and result in the same phenotype A due to the dominance of over .
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