Codominance (F225.1.1 c)

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Define the term codominance
Both the dominant and the recessive allele of the genotype are expressed in the phenotype.
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What are the two alleles for the haemoglobin gene?
Hb^A and Hb^S
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What is the phenotype for the genotype Hb^A Hb^S
Sickle Cell Trait
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A mother has sickle cell trait and a father has normal haemoglobin. State the possible phenotypes and genotypes of their children.
50% chance that the child will have normal haemoglobin (Hb^A Hb^A) 50% chance that the child will have sickle cell trait (Hb^A Hb^S)
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How many antigens are there and where are they found?
There are two antigens; antigen A and antigen B. They are found on the plasma membrane of erythrocytes.
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What antigen allele is recessive?
I^O is recessive to I^A and I^B.
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what are the possible genotypes for blood group A?
I^A I^A, I^A I^O
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What are the possible genotypes for blood group B?
I^B I^B, I^B I^O
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What is the genotype for blood group AB
I^A I^B
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What is the genotype for blood group O?
I^O I^O
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Other cards in this set

Card 2

Front

What are the two alleles for the haemoglobin gene?

Back

Hb^A and Hb^S

Card 3

Front

What is the phenotype for the genotype Hb^A Hb^S

Back

Preview of the front of card 3

Card 4

Front

A mother has sickle cell trait and a father has normal haemoglobin. State the possible phenotypes and genotypes of their children.

Back

Preview of the front of card 4

Card 5

Front

How many antigens are there and where are they found?

Back

Preview of the front of card 5
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