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Human Genetics Punnett Squares, Incomplete Dominance, Co-Dominance and Dominant/Recessive Traits.

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Presentation on theme: "Human Genetics Punnett Squares, Incomplete Dominance, Co-Dominance and Dominant/Recessive Traits."— Presentation transcript:

1 Human Genetics Punnett Squares, Incomplete Dominance, Co-Dominance and Dominant/Recessive Traits

2 Punnett Squares Named after Reginald Punnett Gregor Mendel-pea plants
Gene combinations/predictions

3 What to Know Capital letter – dominant trait
Lowercase letter – recessive trait Homozygous – 2 identical alleles Heterozygous – 2 different alleles Genotype – genetic makeup Phenotype – physical characteristics

4 Examples T – dominant trait t – recessive trait
TT- one example of genotype If T is for tall plants, then Tall is the phenotype for TT TT and tt are homozygous Tt and tT are heterozygous

5 Incomplete Dominance BB is a dominant flower color of blue
YY is a dominant flower color of yellow The cross results in 100% green flowers

6 Codominance Both alleles contribute to the phenotype
You will see each trait exhibited separately Many human genes show codominance Example: chickens with both black and white feathers.

7 More Examples Polygenic traits – skin color, allergies, schizophrenia, cleft lip, and hypertension Multiple alleles – human blood, coat color in rabbits

8 Investigate Genetics Web Lab Directory


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