3. ABO blood groups in humans is an example of codominance. Suppose an individual with type...
3. ABO blood groups in humans is an example of codominance. Suppose an individual with type O blood mates with an individual that is heterozygous for type A blood. What are the expected genotypic and phenotypic ratios of their offspring? What percentage of their offspring will have type O blood?
Homework Answers
Out of the two partners
One has O blood group, which means he is OO. The gametes would be O
Second is heterozygous for A blood group, which means he is AO. The gametes would be A and O
The cross between them would be
| A | O | |
| O | AO (A blood group) | OO (O blood group) |
This shows the 1/2 of offsprings have AO (A blood group) other 1/2 have OO (O blood group).
This gives the same phenotypic and genotypic ratio of 1:1.
1 out of 2 offsprings have O blood group. Which is 1/2 of total offsprings possible. This means 50% of total offsprings have O blood type.
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