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DIHYBRID CROSS EXAMPLE

DIHYBRID CROSS EXAMPLE. Now You Try!.

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DIHYBRID CROSS EXAMPLE

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  1. DIHYBRID CROSS EXAMPLE

  2. Now You Try! In humans, the gene that causes a unibrow (u) is recessive to not connected eyebrows (U); the gene for thick lips (T) is dominant over the gene for thin lips (t). If a male that is homozygous for not connected eyebrows and heterozygous for thick lips mates with a woman who has a unibrow and is heterozygous for thick lips, what is the phenotypic ratio of the offspring?

  3. How do you set it up? U = not connected eyebrows u = unibrow T = thick lips t= thin lips 1. Make one column for each possible different combination of alleles from dad dad 2. Make one row for each possible different combination of alleles from mom mom 3. Fill in the boxes • Genotypes --Dad = UUTt --Mom = uuTt • Possible Different Combinations of Alleles --Dad = UT or Ut --Mom = uT or ut

  4. Results of the Cross UuTT UuTt Only include the phenotypes present in the results. UuTt Uutt Phenotypic Ratio 3 not connected eyebrows & thick lips : 1 not connected eyebrows & thin lips

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