Anonymous asked in Science & MathematicsBiology · 5 months ago

genetics cros problem?

A man with no freckles marries a woman with freckles. The allele for freckles is dominant yet they produce a son with no freckles. Why does this happen? (show the cross)

3 Answers

  • Anonymous
    5 months ago

    The woman is probably heterozygous for freckles. That means she carries only one copy of the freckles gene and her child has only a 50% chance of having freckles since her husband is homozygous recessive for no freckles.

  • Anonymous
    5 months ago

    F is the dominant freckles gene.

    f is the recessive freckles gene.

    The man has ff: every sperm carries an f.

    The woman has Ff: half the eggs carries an F, the other half carry an f.

    When a sperm carrying an f fertilises an egg carrying an f, the child is ff so has no freckles.

    The Punnett square is

    . . f . .f

    F Ff. Ff

    f ff. . ff

    • Zirp
      Lv 7
      5 months agoReport

      f is the recessive no-freckles allele. Otherwise this is a perfect answer

  • Pearl
    Lv 7
    5 months ago

    cause the baby probably took after the father

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