A genetic counsellor creates a pedigree analysis for a couple to determine the couple’s chances of giving birth to a child with cystic fibrosis (CF), which is a recessive disorder. If the counsellor finds that neither the woman’s grandmother nor her grandfather had the disorder but one of their children did, which of the following conclusions can the counsellor make?

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A genetic counsellor creates a pedigree analysis for a couple to determine the couple’s chances of giving birth to a child with cystic fibrosis (CF), which is a recessive disorder. If the counsellor finds that neither the woman’s grandmother nor her grandfather had the disorder but one of their children did, which of the following conclusions can the counsellor make?






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