Punnett Square Notes & Sheep & Peas Pd2

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Punnett Square Notes & Sheep & Peas Pd2

  1. 1. DQ 3-1-10 <ul><li>What is a genotype? </li></ul><ul><li>What is a phenotype? </li></ul><ul><li>How many alleles for each gene does an organism have? </li></ul>Turn in Spot the Dog worksheet, if not already turned in!
  2. 11. Punnett Squares Practice
  3. 12. In guinea pigs, black is dominant Cross a homozygous dominant with a heterozygous guinea pig.
  4. 13. In guinea pigs, black is dominant Cross a homozygous recessive with a heterozygous.
  5. 14. In guinea pigs, black is dominant Cross two heterozygous guinea pigs.
  6. 15. A codominant cross In cattle, red hair and white hair are codominant – they will both show up if the cow is heterozygous. This mixed color is called roan. Cross homozygous white with a homozygous red.
  7. 16. A codominant cross In cattle, red hair and white hair are codominant – they will both show up if the cow is heterozygous. This mixed color is called roan. Cross two heterozygous roans.
  8. 17. A codominant cross In cattle, red hair and white hair are codominant – they will both show up if the cow is heterozygous. This mixed color is called roan. Cross a homozygous dominant with a heterozygous roan.

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