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Mendelian Genetics Thursday 10 /17/13

Mendelian Genetics Thursday 10 /17/13. Quiz #3 Mendel’s Laws Law of Independent Assortment genetics problems with two characters beyond Mendel X-linked Polygenic inheritance Incomplete Dominance Co-Dominance / Multiple Alleles Environmental influence.

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Mendelian Genetics Thursday 10 /17/13

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  1. Mendelian Genetics Thursday 10/17/13 • Quiz #3 • Mendel’s Laws • Law of Independent Assortment • genetics problems with two characters • beyond Mendel • X-linked • Polygenic inheritance • Incomplete Dominance • Co-Dominance / Multiple Alleles • Environmental influence

  2. Sex-linked Genes (X-linked genes) • genes that are found on the X chromosome

  3. Polygenic inheritance: ex: skin color, height, eye color Genotypes Phenotypes

  4. Incomplete Dominance: • dominant allele • heterozygous individuals show

  5. Incomplete Dominance: • what happens if we cross two heterozygous individuals? see figure 23.13 for another example

  6. Multiple Alleles • individuals are diploid • more Co-Dominance: see fig 23.15 Can a woman with type A blood have a type O daughter?

  7. Gene Interact with the Environment to Produce a Phenotype: • environmental conditions • e.g., Siamese Cats - the black tail, paws and ears are the result of temperature impact on an enzyme • Nature vs. Nurture: • even when there is a strong genetic component,

  8. Colorblindness is a recessive X-linked trait. Individuals express the trait (colorblindness) if they do not have at least one copy of the dominant allele. If mom and dad are NOT colorblind, but have a son who IS colorblind, what are the genotypes of the parents? If mom is a carrier and dad is NOT colorblind, what is the probability that they will have a son who is colorblind? a. 0% b. 25% c. 50% d. 75% e. 100% Can they have a daughter who is colorblind? a. yes b. no

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