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Directions: Watch this video and then use the information below to answer any questions that follow. There are three different...Question
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There are three different alleles for blood-type: A, B, and O. A and B are dominant over O. If a person has A and B genes, he or she has blood-type AB. This is referred to as a codominant pattern of heredity.
Jane's mother and father have type B blood. When Jane's blood was tested, she found she had a blood-type of O. Select the best response from the options below.
Modes of Inheritance | BioNinja
a
One of them has a recessive gene for type O blood.
b
Both parents are homozygous for type B blood.
c
One of them is homozygous for type B blood.
d
Both parents have a recessive gene for type O blood.
There are three different alleles for blood-type: A, B, and O. A and B are dominant over O. If a person has A and B genes, he or she has blood-type AB. This is referred to as a codominant pattern of heredity.
Jane's mother and father have type B blood. When Jane's blood was tested, she found she had a blood-type of O. Select the best response from the options below.
Modes of Inheritance | BioNinja
a
One of them has a recessive gene for type O blood.
b
Both parents are homozygous for type B blood.
c
One of them is homozygous for type B blood.
d
Both parents have a recessive gene for type O blood.
Answers
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Answered by
GPT-4o mini
To determine the best response from the provided options, we need to consider the inheritance of the blood type alleles.
Jane's parents both have type B blood. The possible genotypes for type B blood are:
1. Homozygous (BB) - two dominant alleles
2. Heterozygous (BO) - one dominant allele (B) and one recessive allele (O)
Since Jane has type O blood, her genotype must be OO (recessive). This means she must have inherited one O allele from each parent. Therefore, for Jane's parents to have a child with type O blood, at least one of them must carry the recessive O allele.
Now, let's analyze the options:
a) One of them has a recessive gene for type O blood.
- This could be true if one parent is heterozygous (BO).
b) Both parents are homozygous for type B blood.
- This cannot be true, as two BB parents cannot produce an OO child.
c) One of them is homozygous for type B blood.
- This could be true if the other parent is heterozygous (BO). However, it does not ensure Jane could have type O blood as both homozygous B (BB) parent wouldn't pass on an O allele.
d) Both parents have a recessive gene for type O blood.
- This implies both are BO. This is true since both can pass an O allele to create a child with type O blood.
Based on this reasoning, the best response is:
**a) One of them has a recessive gene for type O blood.**
This refers to the scenario where one parent is heterozygous (BO), allowing for the production of a child with OO (type O blood).
Jane's parents both have type B blood. The possible genotypes for type B blood are:
1. Homozygous (BB) - two dominant alleles
2. Heterozygous (BO) - one dominant allele (B) and one recessive allele (O)
Since Jane has type O blood, her genotype must be OO (recessive). This means she must have inherited one O allele from each parent. Therefore, for Jane's parents to have a child with type O blood, at least one of them must carry the recessive O allele.
Now, let's analyze the options:
a) One of them has a recessive gene for type O blood.
- This could be true if one parent is heterozygous (BO).
b) Both parents are homozygous for type B blood.
- This cannot be true, as two BB parents cannot produce an OO child.
c) One of them is homozygous for type B blood.
- This could be true if the other parent is heterozygous (BO). However, it does not ensure Jane could have type O blood as both homozygous B (BB) parent wouldn't pass on an O allele.
d) Both parents have a recessive gene for type O blood.
- This implies both are BO. This is true since both can pass an O allele to create a child with type O blood.
Based on this reasoning, the best response is:
**a) One of them has a recessive gene for type O blood.**
This refers to the scenario where one parent is heterozygous (BO), allowing for the production of a child with OO (type O blood).
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