1. a. In humans, the allele for A type blood and the allele for B type blood show codominance. A person with both alleles has blood type AB. Both A and B dominate type O. A person with an allele for type A blood and type O blood marries someone with an allele for type B blood and type O blood. List the types of offspring they could have and the probability for each blood type in the offspring. (A allele = IA, B allele = IB , O allele = i) b. For this problem use the information given in problem 15. A young lady with type O blood gave birth to a baby with type O blood. In a court case she claims that a certain young man is the father of her child. The man has type A blood. Could he be the father? Can it be proven on this evidence alone that he is the father?
Added by Ricardo E.
Step 1
The first parent has an allele for type A blood and type O blood, so their genotype is \( I^A i \). The second parent has an allele for type B blood and type O blood, so their genotype is \( I^B i \). Show more…
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Nimat P.
1- Consider the ABO blood types in humans. A person with type A blood could have either two copies of the A allele or one each of the A allele and the O allele. A person with type B blood could have either two copies of the B allele or one each of the B allele and the O allele. A person with type AB blood has one copy of each of the A and B alleles. A person with type O blood has two copies of the O allele. Is the O allele dominant or recessive? 2- If two people with type AB blood (both of them have AB blood) have children, what proportion of the children would you expect to have type A blood? Explain your logic.
Nicole S.
Use the information below to answer questions 3-6. There may be a number of possible alleles for a given gene within a population. In a multiple allele system, the dominance relationships between the various alleles must be considered. One of the more familiar examples of a multiple allelic system is that of human ABO blood types. The gene involved codes for a protein on the outside of red blood cells. Three alleles (IA, IB, and i) determine whether the protein is present or absent and the form of the protein present. The A and B alleles code for the A and B forms of the protein and are co-dominant to each other. The O allele (i) codes for no protein and is recessive to both A and B. A couple with the following blood types: the man has type AB and the woman has type B, discover their child has type O blood. Is it possible that one of these 'parents' may not actually be the genetic parent of this child? If so, which one, and how do you know?
Jenny W.
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