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15 Jun 2018

In humans, the ABO blood system is controlled by three alleles: IA, IB, and i. Betsy and Bob have two children named Billy and Belle. Betsy has type A blood and Bob has type B blood. Billy’s blood is type AB, but Belle’s blood type is type O. Use a Punnett Square to answer the questions below.

What is Betsy’s genotype for her blood type? ________________

What is Bob’s genotype for his blood type? _________________

What is Billy’s genotype for his blood type? _________________

What is Belle’s genotype for her blood type? ________________

If Betsy and Bob have a third child, what is the probability the child would have type B blood? Explain. ________

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Jarrod Robel
Jarrod RobelLv2
16 Jun 2018

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Related questions

ABO blood types are inherited via a single autosomal gene with 3 alleles. Allele A (IA) and allele B (IB) are co-dominant to recessive allele O (i). Sarah has type B blood. Scott has type AB blood.

a. Is it possible that a biological child of Sarah and Scott inherit the phenotype of type O blood? Briefly explain your answer.

b. Suppose that Sarah and Scott’s first child has type A blood. What are Scott and Sarah’s genotype? What proportion of Scott and Sarah’s future offspring are expected to have blood type AB?

Scott:

Sarah:

Proportion of future offspring expected to have blood type AB:

6. In human ABO blood typing, there are three alleles possible (IA, IB, i) that result in four blood types (A, B, AB, and O).

a) If one parent phenotype is type A blood and the other type B blood, and they have four children who represent all of the blood types, what are the genotypes of the parents?

b) Could a child of type O blood have a type A father and a type AB mother?

c) If the first child is type A blood, and his parents are type AB and type O, what is the chance that the second child would have type A blood?

There are also traits that have more than two alleles, one example of which is the ABO blood system that determines your dominant blood type. Most of you should know what type of blood you are. In the ABO blood system alleles A and B are co-dominant, and the O allele is recessive to A and B. Blood type A (phenotype) is found in individuals with genotypes AA or AO, while blood type B is found in individuals with genotypes BB or BO. The "O" blood type is only found in individuals with the genotype OO, and the blood type AB can ONLY be found in an individual with the genotype AB.

In this series of questions, you are working as a technician for the Maury Povich television show, and you need to determine the paternity of Sheila's baby. Sheila has blood type AB.

The first candidate for the father, Tony, has a known blood type of AO (type A blood). Which of the following Punnett squares illustrates the possible blood types of Sheila and Tony's offspring?

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