The genotypes of a Husband and Wife are IAIB and IAi.

Among the blood types of their children, how many different genotypes and phenotypes are possible?

  • Option 1)

    3 genotypes ; 3 phenotypes

  • Option 2)

    3 genotypes ; 4 phenotypes

  • Option 3)

    4 genotypes ; 3 phenotypes

  • Option 4)

    4 genotypes ; 4 phenotypes

 

Answers (1)

 

Explanation of law of independent assortment -

Gametes have gene R and r, and they also have alleles Y and y, the segregation of 50% of R and 50% of r is independent from segregation of 50% Y and 50% of y 

- wherein

Thus, there are 4 genotypes of gametes, RY, Ry , rY and ry each with frequency 25% of the total gametes produced. 

 

 


Option 1)

3 genotypes ; 3 phenotypes

This is incorrect option

Option 2)

3 genotypes ; 4 phenotypes

This is incorrect option

Option 3)

4 genotypes ; 3 phenotypes

This is correct option

Option 4)

4 genotypes ; 4 phenotypes

This is incorrect option

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