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15 cards from this deck
Gene located on a sex chromosome
XX
XY
Inability to distinguish between red and green
Inability to form blood clots properly
Males need only one recessive gene on X to express trait
Two recessive genes (one on each X chromosome)
Heterozygous female with one normal and one abnormal allele
XN Y
XN XN
XN Xn
Xn Y
Xn Xn
X chromosome
25% each: normal female, carrier, normal male, colour blind male
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