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Blood type is a study in genetics! If a person has type AB blood then you can say that this pattern of inheritance is 

          Blood type is a study in genetics!  If a person has type AB blood then you can say that this pattern of inheritance is

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Biology for AP Courses
Biology for AP Courses
Julianne Zedalis, John Eggebrecht
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Blood type is a study in genetics! If a person has type AB blood then you can say that this pattern of inheritance is
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Blood type in humans is an example of a trait that has multiple alleles. The alleles for type A blood and type B blood are codominant, and type O blood is recessive to both type A and type B. If a girl with type AB blood has a brother with type O blood and a sister with type B blood, which of the following genotypes could it be possible for their parents to have?

Anand J.
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Blood type is inherited by multiple alleles; this means that more than two genes code for this trait. The genes involved are the A, B, and O genes. The A and B genes are co-dominant, meaning that they are both expressed if present. Both the A and B genes are dominant over the O gene. Therefore, if someone has type O blood, then they have two O genes. A woman with type A blood marries a man with type B blood. They have a child with type O blood. What are the genotypes of the parents? AA and BB AO and BB AO and BO AA and BO OO and OO

Adi S.
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A person has blood type A, and the genotype AO. This indicates that A is recessive B is recessive AB is recessive O is recessive A person with blood type O has the genotype AB AO BO OO

Adi S.
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Transcript

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00:01 So here in this question, if mother and father are heterozygous for blood type a and blood type b, let's assume that mother is heterozygous for blood type a and father is heterozygous for blood type b.
00:24 Cross between them, let's draw upon its square.
00:30 Now here we are taking gametes of mother on one side and chemids of father on another side.
00:39 So the genotype of off -strings will be getting is allele i -a and i -b showing ab blood type, i -b and i -o showing b blood type, i -a and i -o showing a blood type, and i -o -i -o showing o blood type here.
01:07 Allel i -a and i -b shows codominence and therefore they shows a -b blood type.
01:18 In the phenotype, allel i -b, i -o, as we know that allel i -b is dominant over allel i -o, and therefore it will be showing b blood type in the offspring...
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