Download Multiple Alleles Review - Ms Laird`s World of Science

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Multiple Alleles Review
- in this situation you have more than two alleles that are controlling a single
trait. Remember – no matter how many alleles control the trait, we can only
ever carry a maximum of two alleles for any trait on our DNA.
Example:
Human Blood Type – A antigens and B antigens are controlled by dominant
alleles (A and B). i represents the recessive allele.
Question – what other type of inheritance is demonstrated by the way that
the A and B alleles interact? Hint – what happens when you have A and B?
(answer at the bottom)
Possible Genotypes
Possible Phenotypes
AA or Ai
A blood type
BB or Bi
B blood type
AB
AB blood type
ii
O blood type
Example:
What is the chance of having a child with B blood type if you have one parent
that is homozygous for B blood type and one parent that is heterozygous for
A blood type?
BB x Ai
B
B
A
AB
AB
i
Bi
Bi
There is a 50% probability of having a child with B blood type.
Answer - Co-Dominance
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