Anatomy Question Please Answer them all A Using a punnett sq

Anatomy Question: Please Answer them all.

A. Using a punnett square, show the possible genotypes for John and Andrea\'s children? (John has O blood type and Andrea has A blood type)

B. Based on the blood typing results, could Daryl be John and Andrea\'s Son? How Do you know this? ( Daryl has O blood type)

Solution

A. Andrea :Mother has A blood type , her genotype will be either AO or AA

John :Father has O blood type ,his genotype will be OO.

O allele is masked by the presence of A allele or B allele.

OO blood group is expressed only in presence of OO alleles.

Father

Father

B. Daryl has O blood type.For O blood froup to be expressed in child, both parents should have O alleles that together will contribute to make OO blood type of their son.So, yes Daryl is the son of John and Andrea.