Co-Dominance & Sex Linkage (5.1.2) 0.0 / 5 ? BiologyDNA, genetics and evolutionA2/A-levelOCR Created by: recoveranddiscoverCreated on: 21-02-16 18:30 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. 1 of 7 Give an example of co-dominance. Human blood groups- the group AB is formed since I-A and I-B are both dominant. 2 of 7 What are sex-linked genes? Genes carried on the X chromosome. 3 of 7 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. 4 of 7 What does it mean that females are homogametic? They only make one type of gamete, as they have two X chromosomes. 5 of 7 What does it mean that males are heterogametic? They can make two types of gamete, as they have an X and a Y chromosome. 6 of 7 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. 7 of 7
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