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13 cards from this deck
When a gene on a sex chromosome controls a characteristic
X chromosome
Only one X; no masking allele on Y
Colour blindness and haemophilia
About 8%
Bleeding disorder; lack of clotting proteins
50%
Cannot be carriers
Both alleles expressed; intermediate phenotype
Roan (mixture of red and white)
RrRrRr (heterozygous)
Pink
1:2:1
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