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Animal Genetics: Dominant vs. Recessive Traits

Animal Genetics: Dominant vs. Recessive Traits. Intro to Agriculture Science. GOALS:. Explain the difference between dominant and recessive genes. Use a Punnett Square to predict genotypic and phenotypic ratios of offspring. What do we already know?. review…. Phenotype.

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Animal Genetics: Dominant vs. Recessive Traits

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  1. Animal Genetics:Dominant vs. Recessive Traits Intro to Agriculture Science

  2. GOALS: • Explain the difference between dominant and recessive genes. • Use a Punnett Square to predict genotypic and phenotypic ratios of offspring.

  3. What do we already know? review…

  4. Phenotype • Appearance! • Result of Genotype Example: Bw = Black Coat Because B is dominant

  5. Genotype • The genetic makeup! • Alleles from parents • What you can’t see Example: Alleles that code for good milk production.

  6. Alleles • A pair of genes • That code for the same trait Example: Hair Color Eye Color Height

  7. What do we need to know? vocabulary…

  8. Dominant Genes • Determine what the offspring will look like! • Expressed as capital letters • Mask recessive genes. Example: B=Black w=White Dominant Allele = B

  9. Recessive Genes • Sometimes determine what the offspring will look like. • Expressed as lowercase letters Example: B=Black w=White Recessive allele = w

  10. What is it called when both allelesare the same? • Homozygous

  11. Example AA or aa

  12. Identify... Dominant & Recessive ? ? AA or aa

  13. Homozygous Dominant Homozygous Recessive AA or aa

  14. What is it called when both allelesare different? • Heterozygous

  15. Example Aa

  16. Lets Get to It! Punnett Squares Punnett Squares GeneticCrosses GeneticCrosses Monohybrid Crosses Monohybrid Crosses

  17. What the heck are they? • Punnett squares are genetic crosses used by biologists to predict the probability that certain traits will be inherited by offspring.

  18. What do they look like? • Punnett Square:

  19. MONOHYBRID CROSS • A Punnett Square • Using one pair of contrasting traits • Ex: hair color

  20. Example #1: • Homozygous vs. Homozygous

  21. Example #1: • A White Sow (ww) crossed with • A Black Boar (BB)

  22. (ww) Homozygous vs. Homozygous w w B Bw Bw (BB) B Bw Bw

  23. Example #2: • Homozygous vs. Heterozygous

  24. Example #2: • A White Sow (ww) crossed with • A Black Boar (Bw)

  25. (ww) Homozygous vs. Heterozygous w w B Bw Bw (Bw) w ww ww

  26. Example #3: • Heterozygous vs. Heterozygous

  27. (Bw) Heterozygous vs. Heterozygous B w B BB Bw (Bw) w Bw ww

  28. Result…

  29. Try it! cfu…

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