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IV. Lactose is a sugar found in milk. It is digested by an enzyme called lactase. Some people
cannot make lactase. The condition they have is called lactose intolerance. The condition is
caused by a recessive allele. This means that only people with the homozy gous recessive
genotype can be lactose intolerant. (a) What is meant by the term homozygous? [I pt] (b) State
the two possible genotypes of an individual who is not lactose intolerant. Use the sumbols D for
the dominart allele and d for the resessive allele. 1 [1 pt] 2. (c) (i) A Heterozygous mother and a
recessive father have two children. Give the genotypes of the parents and their children. Parent
genotype: mother [1.5pts] Punnett square: father F1 genotype: (ii) What is the probability that
the children are lactose intolerant? [ 0.5 pt ]

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