Co-Dominance & Sex Linkage (5.1.2)

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What sort of letters are used for co-dominance?
We can't use capital and lower case letters, so we choose 1 large neutral letter.
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Give an example of co-dominance.
Human blood groups- the group AB is formed since I-A and I-B are both dominant.
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What are sex-linked genes?
Genes carried on the X chromosome.
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How would you spot a condition that is sex linked?
When a large number of offspring are studied, a characteristic will be much more common in one sex than another.
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What does it mean that females are homogametic?
They only make one type of gamete, as they have two X chromosomes.
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What does it mean that males are heterogametic?
They can make two types of gamete, as they have an X and a Y chromosome.
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Give examples of sex-linked conditions.
Haemophilia- females can be carriers, but only men can have the condition. Red/green colour blindness. Duchenne muscular dystrophy.
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Other cards in this set

Card 2

Front

Give an example of co-dominance.

Back

Human blood groups- the group AB is formed since I-A and I-B are both dominant.

Card 3

Front

What are sex-linked genes?

Back

Preview of the front of card 3

Card 4

Front

How would you spot a condition that is sex linked?

Back

Preview of the front of card 4

Card 5

Front

What does it mean that females are homogametic?

Back

Preview of the front of card 5
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