Blood Type

3B3 How To -
Identify Blood Type Genotypes

Multiple Alleles and Blood Types

• Multiple Alleles - when more than two alleles are available for a trait in a population

• Ex. 3 Alleles available in human Blood Types

  • I^A - Type A

  • I^B - Type B

  • i - Type O

• I^A and I^B are codominant over i​

• Results in 4 Phenotypes

  • Type A

  • Type B

  • Type AB

  • Type O

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In human blood, there are ​

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alleles and ​

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blood types.

Multiple Choice

Which allele represents Type O?

Multiple Alleles and Blood Types

Multiple Alleles and Blood Types

​Type O is the universal donor because Type O blood cells do not contain antigens.

Multiple Choice

What is the genotype of heterozygous Type A?

Multiple Choice

What is the genotype of Type O?

Multiple Choice

What is the genotype of homozygous Type A?

Multiple Choice

What is the genotype of Type AB?

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A man heterozygous for blood type A​

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marries a woman heterozygous for blood type B​

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. The chance

that their first child will have type O​

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...

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If a mother with type AB blood ​

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and a father heterozygous for type B blood ​

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have a baby, which blood type is it impossible for the baby to have? ​

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Multiple Choice

A father with blood type AB (IAIB) and a mother with a blood type A (IAi) have a child.

What is the chance that a child of these parents will have blood type B?

• 0%

• 25%

• 50%

• 75%

• 100%

• ​Genotypes for Type A

• Genotypes for Type B

• Genotype for Type AB

• Genotype for Type O