Some traits are controlled by more than 2 alleles. For example, there are three

Question

Some traits are controlled by more than 2 alleles. For example, there are three different alleles for the antigens in human blood typing: 'I^A' and 'I^B' which are co-dominant alleles, and 'i' which is the recessive allele. Hence the genotype for type AB is 'I^A I^B' and for type O is 'ii'. A man with blood type AB has children with a woman of blood type O. What are the genotypic and phenotypic ratios that can be expected for their children? A man with blood type A has children with a woman of blood type B. If both are heterozygous, what are the genotypic and phenotypic ratios that can be expected for their children? X-linked genes are found on the part of the X-chromosome that is not in the y-chromosome. Therefore females with two X-chromosomes possess two X-linked alleles, while males with one X-chromosome and one y-chromosome possess only one X-linked allele. Red-green colorblindness results from a recessive X-linked allele'X^b' while the normal allele is 'X^B'. A woman with normal color vision (whose father is colorblind) plant to have children with a colorblind man. What are the genotypes of the woman and the man? What are the genotypic and phenotypic ratios expected for their children? (Calculate the ratios separately for the girls and the boys.)

Explanation / Answer

Q.No 11

Type IA

Type IB

Type ii

Type IA/i

Type IB/i

Type ii

Type IA/i

Type IB/i

           

                        Genotype 1: Type IAIB

                        Genotype 2: Type ii

                        Phenotype : 50% IAIB : 50% ii

Q.No 12

Type IA

Type IA

Type IB

Type IAIB

Type IAIB

Type IB

Type IAIB

Type IAIB

                        Genotype 1: Type IA

                        Genotype 2: Type IB

                        Phenotype : 50% IA : 50% IB

Type IA

Type IB

Type ii

Type IA/i

Type IB/i

Type ii

Type IA/i

Type IB/i

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