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9 August, 02:41

Cystic fibrosis is a hereditary disease that affects the respiratory and digestive systems. cystic fibrosis occurs when two recessive genes (cc) are present. a person with one allele for cystic fibrosis is called a carrier (cc) of the disease. if the mother is a carrier of the disease and the father is homozygous dominant, what are the chances that their first child will be a carrier of cystic fibrosis?

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  1. 9 August, 03:01
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    If a mother is a carrier of the disease, her genotype is Cc (heterozygous). Father’s genotype is CC (dominant homozygous)

    Parents: Cc x CC

    F1: CC CC Cc Cc

    This means that the chances are 50% that their first child will be a carrier of cystic fibrosis (Cc).
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