Respuesta :
The complete question is as follows.
For practice, let's work with blood groups. Three alleles exist for human blood types. They were not numbered, but instead marked with the letters for A,B and O. The labelling convention is: IA, IB and Ii. IA and IB are codominant alleles, whereas Ii is the recessive type O. Humans are diploid; every individual carries only two alleles.
1.) List all possible blood group genotypes.
2.) How many kinds of homozygotes are there?
3.) How many kinds of heterozygotes are there?
4.) There are only 4 blood group phenotypes (A, B, AB and O). Based on the information given here , list the genotypes that produce each phenotype.
a.) type A
b.) type B
c.) type AB
d.) type O
Answer and Explanation: Codominant alleles are a relantionship between two alleles where there is no dominance over each other. When the individual is heterozygote, the 2 alleles is expressed. Because of it, human blood type has 3 alleles, 6 genotypes and 4 phenotypes.
1.) The genotypes are: IAIA, IAi, IBIB, IBi, IAIB and Ii
2.) There are 3 homozygotes: IAIA, IBIB and ii
3.) For heterozygote, there are also 3: IAi, IBi and IAIB
4.) The genotypes for each phenotypes are:
type A: IAIA and IAi
type B: IBIB and IBi
type AB: IAIB
type O: Ii
Note that because of the codominance, types A and B can be all homozygous dominant (IAIA or IBIB) or heterozygous dominant (IAi or IBi) and it also "creates" another trait, the combination of the 2 types: IAIB.
Answer:
I think this is the complete question you were hoping to ask:
For practice, let's work with blood groups. Three alleles exist for human blood types. They were not numbered, but instead marked with the letters for A,B and O. The labelling convention is: IA, IB and Ii. IA and IB are codominant alleles, whereas Ii is the recessive type O. Humans are diploid; every individual carries only two alleles.
1.) List all possible blood group genotypes.
2.) How many kinds of homozygotes are there?
3.) How many kinds of heterozygotes are there?
4.) There are only 4 blood group phenotypes (A, B, AB and O). Based on the information given here , list the genotypes that produce each phenotype.
a.) type A b.) type B c.) type AB d.) type O.
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1. All possible blood group genotypes are
AA, AO, BB, BO, AB, OO
2. there are three kinds of homozygotes: AA, BB, OO
3. There are also three kinds of heterozygotes: AO, BO, AB
4. type A: AA, AO type B: BB, BO type AB: AB, type O: OO
Explanation:
The human blood group system is depicted in such a way that it is based on the presence or the absence of antigens A and B carried on the surface of the red blood cells. The pattern of inheritance of both A and B is usually in the codominant form. the blood types includes, A, B, O, AB.
1. All possible blood group genotypes are
AA, AO, BB, BO, AB, OO
2. there are three kinds of homozygotes: AA, BB, OO
3. There are also three kinds of heterozygotes: AO, BO, AB
4. type A: AA, AO type B: BB, BO type AB: AB, type O: OO
