Question

homework - non-mendelian genetics
you are told that a child has type a blood. you are also told the child has one biological parent that has type o blood. the childs possible genotype(s)
would be
aa only
aa or ao
ao only
ao or oo
aa or oo

Explanation:

Blood type is determined by alleles. Type O blood has the genotype \(OO\). The child has Type A blood. Since one parent is \(OO\), the child must get an \(A\) allele from the other parent. So the child's genotype can only be \(AO\) (as \(AA\) would require the other parent to contribute an \(A\), but since one parent is \(OO\), the only way for the child to have Type A is to get one \(A\) from the non - O parent and \(O\) from the O parent).

Answer:

AO only