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12 cards from this deck
Gene located on a sex chromosome
XX
XY
Red-green colour blindness and haemophilia
Inability to distinguish between red and green
Inability to form blood clots properly
Males need only one recessive gene on their single X chromosome to express the trait
Heterozygous females who don't express the trait but can pass it to offspring
XnYX^n YXnY
XnXnX^n X^nXnXn
XNXnX^N X^nXNXn
XNYX^N YXNY
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