U.C.E BIOLOGY 2002 PAPER 1 QN 29

a) (i) which chromosomes are responsible for determining sex in humans?

(ii) Using appropriate symbols show how sex is determined in humans.

b) Red – green color blindness is a defect caused by a recessive gene carried on the X chromosome. What would be the phenotype of the offspring when a normal woman marries a color blind man? Show your working.

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