Anonymous
Anonymous asked in Science & MathematicsBiology · 1 month ago

What is the likelihood of Sally and George having a child that is affected with cyctic fibrosis (only recessive alleles present)?

Sally is a heterozygous carrier for cyctic fibrosis (Ff) and is going to have a child with George, who is affected with cyctic fibrosis (ff). If Sally undergoes nondisjunction in meiosis II, what is the likelihood of Sally and George having a child that is affected with cyctic fibrosis (only recessive alleles present)?

A.

5/8

  B.

1/4

  C.

1/2

  D.

1/3

  E.

7/8

2 Answers

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  • 1 month ago
    Favourite answer

    C. 1/2

    1/2 that the secondary oocyte is ff

    1 that George's sperm is f

    Overall: 1/2 X 1 = 1/2

    • hcbiochem
      Lv 7
      1 month agoReport

      I edited my answer. It is actually 1/2. There is a probability of 1 that George's sperm has a recessive allele. 

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  • Zirp
    Lv 7
    1 month ago

    I'm not sure what kind of nondisjunction they mean here.

    Cystic fibrosis is a simply recessive disease. If a carrier and a patient make a baby, the baby has a 50 % chance of being a patient, and a 50 % chance of being a carrier

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