Mendel

Mendel
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  • Sources:  www,ck12.org; www.ndsu.edu; Biology by Miller and Levine
  • I'm Stevie Science, and today I'm going to teach you all about Gregor Mendel's Second Experiment!
  • We're going back in time to the 1850s and 60s to meet a man known as the "father of genetics"... Gregor Mendel!
  • I'll tell you about one of my favorite experiments.  One day, I was wondering if one trait can affect another trait... so I experimented.
  • I used pea plants to track trait inheritance.  I crossed two pea plants that were homozygous dominant and recessive.
  • F1:
  • This crossing (breeding) produced heterozygous peas that all display a dominant phenotype.
  • P Gen:   homozygous with different geno (genes) and phenotypes (appearancces)
  • Then...
  • rryy (recessive:  only expressed when no dominant is present)
  • F2:
  • The 2nd cross resulted in many different alleles (different gene combos), proving that one trait does not have influence over another.
  • +
  • RRYY (dominant:  always expressed if present)
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