can't find answer to biology ? - Biology Forum

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Cat 16 years, 7 months ago

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- May 3, 2008 at 3:10 pm #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!
- May 3, 2008 at 5:32 pm #83846
  mith
  Participant
  http://biology-online.org/biology-forum … are#p96192
- May 13, 2008 at 12:15 am #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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