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For these questions, you are using the A, B, and O to represent the alleles in...

For these questions, you are using the A, B, and O to represent the alleles in this example.

The ABO blood system works in a Mendelian fashion, but has 3 possible alleles at one locus (A, B, and O alleles). Each person can have only 2 of those alleles in their genotype. A and B are both dominant (and so can be co-dominant), and O is recessive to both A and B. So, for example, if you have B blood type, your genotype could be either BB or BO -- both of those genotypes would yield B phenotype. If your phenotype is AB blood type, then your genotype is AB.

Given the following scenario determine the genotypes of all these individuals. (Hint: What can the offspring tell you about the parents?)

You have a mother who has two children. There are two men who might need to pay child support; we need to figure out which man owes. Who is the father of these two children?

Mother: blood type A

Child 1: blood type O

Child 2: blood type A

Possible father 1: blood type A

Possible father 2: blood type O

List all possible genotypes for each of these individuals (mother, 2 children, 2 men).

Based on this information, is it possible to exclude either of these men as being the father? Why or why not

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Answer #1

Given i) there are 3 alleles for ABO blood group.ie; I^, I° e 3°Y i 911 - iv) TA & IB = Co dominat alleles TA & Ili omenant ICase I. x Possible father & (As one child has (As one child has i i genotype . oblood group O blood group , T4 Gametes offsgenotypes any of them could be the father. I

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