Biology Forum Genetics can’t find answer to biology ?

last updated by Cat 16 years ago
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    • #9571
      FredBurroughs
      Participant

      if someone could answer this for me, i’d be grateful. i’ve spent the last 2 nights trying to figure it out….

      Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

      a. 2:1
      b. 9:3:3:1
      c. 1:1
      d. 1:2:1
      e. 3:1

      I have a really unhelpful Biology book, so if someone could explain the answer, that would be great!

    • #83846
      mith
      Participant
    • #84046
      Cat
      Participant

      Attached earlobes (a) are recessive to free earlobes (A).
      What genotypic ratio is expected when an individual with attached earlobes (aa) mates with an individual heterozygous for free earlobes (Aa)?

      Aa x aa => 50% Aa + 50% aa => 1:1

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