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11 /12/13 Topic: More Punnett Squares Do Now:

11 /12/13 Topic: More Punnett Squares Do Now: Complete the Punnett Square for a mom who is homozygous dominant for long arms (AA) and a father with short arms ( aa ).

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11 /12/13 Topic: More Punnett Squares Do Now:

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  1. 11/12/13 Topic: More Punnett Squares Do Now: • Complete the Punnett Square for a mom who is homozygous dominant for long arms (AA) and a father with short arms (aa). • What is the percentage chance that the children in question one will have short arms? • Complete the Punnett Square for a mother who is heterozygous for her nose type (Ll) and a father who is homozygous recessive for a pointed nose (ll). • What is the percentage chance that the children in question three will have pointed noses?

  2. 11/12/13 Topic: More Punnett Squares Do Now: • Check the beginning of your homework!

  3. Incomplete Dominance • Incomplete dominance results in a phenotype that is a blend of a heterozygous allele pair. Red flower + Blue flower =>Purple flower

  4. Codominance • Codominanceresults in a phenotype that shows both traits of an allele pair. Ex., Red flower + White flower=>Red & White spotted flower • If merpeople have tail color alleles B (blue) and G (green) that follow the codominance inheritance rule, what are possible genotypes and phenotypes? GenotypesPhenotypes

  5. Regulatory Genes • Regulatory genes regulate the expression of other genes. • For example, a regulatory gene may ‘silence’ another gene from expressing its dominant trait. The Manx cat has no tail since it has a regulatory gene that silences the gene that expresses the tail. This tail silencing gene is dominantS = silences tail gene = no tail (Manx cat) s = doesn’t silence tail gene = has tail (non-Manx cat) Question: Can 2 Manx cats without tails have a kitten with a tail? Show your answer using Punnett Square.

  6. Complex Trait: Hagrid’s Height • Hagrid’s father was a wizard and his mother a giantess. The normal height for giants and wizards are: Giants = about 20 ft. & Wizard = 5-6 ft. • Given that Hagrid is described to be about 12 ft., what type of genetic inheritance may be at work for Hagrid’s height?

  7. Complex Trait: Harry’s Eyes • Eye color in humans has multiple alleles: • B = brown (codominant with green) • G = green (codominant with brown) • b= blue (recessive to both brown and green) • Draw a Punnett Square with Harry’s parents: assuming Lily with green eyes (GG) and James with hazel eyes (BG). • Harry has green eyes. What is the genotype for Harry’s eye color? • If Harry had any siblings, what color(s) could their eyes be?

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