October 8 lecture - October 08 2010 Dihybrid crosses,...

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October 08 2010 Dihybrid crosses, Mitosis, and Meiosis Today’s questions: I. How are alleles from different genes transmitted to offspring(together, or independently?) II. What is the physical basis of Mendel’s rules? a. Mitosis: How cells divide during asexual reproduction and during growth b. Meiosis: How cells divide prior to formation of eggs and sperm (sexual reproduction) Q1. Predict the results of a cross between PPTT and pptt parents, IF ALLELES OF DIFFERENT GENES DO NOT STAY TOGETHER. Parental genotypes: PPTT and pptt Gamete genotypes: PT and pt F1 offspring from cross: PpTt Gametes produced by F1 parents: PT Pt pT pt F2 offspring from selfing: *9:3:3:1 purple/terminal: purple/axial: white/terminal: white/axial Mendel’s actual results (seed color and shape cross); Y=yellow, y=green R=round, r=wrinkled YYRR x yyrr F1s all make yellow round seeds (YyRr) When F1s are self-fertilized, phenotypes of F2 offspring are: balba Q2. What are the frequencies of the observed genotypes (as ordered above)?What hypothesis
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October 8 lecture - October 08 2010 Dihybrid crosses,...

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