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Solution


Q.

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     [2017]
1 3 genotypes; 4 phenotypes  
2 4 genotypes; 3 phenotypes  
3 4 genotypes; 4 phenotypes  
4 3 genotypes; 3 phenotypes  

Ans.

(2)

If the genotypes of husband and wife are IAIB and IAi respectively, then the probabilities of genotypes and phenotypes among their children can be worked out as:

Genotype:         IAIA          IAi           IAIB           IBi

Phenotype:         A                A               AB              B

Thus, there are four possible genotypes, viz., IAIA,IAi,IAIB and IBi and three possible phenotypes, viz., A, AB and B among the children.