gen380F11StLect3

gen380F11StLect3 - GENETICS 380 LECTURE 3: Independent...

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http://www.cellimagelibrary.org/images/10086 GENETICS 380 LECTURE 3: Independent Assortment
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Mendel used a Dihybrid Cross to simultaneously observe the inheritance of 2 traits YELLOW ROUND GREEN WRINKLED X P o ALL YELLOW ROUND F 1 YELLOW & ROUND GREEN & ROUND YELLOW & WRINKLED GREEN & WRINKLED F 2 9 3 3 1
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Results from Dihybrid Cross are the same as results from individual Monohybrid Crosses YELLOW ROUND GREEN ROUND YELLOW WRINKLED GREEN WRINKLED 9 3 3 1 F 2 Yellow : Green = 9+3 : 3+1 = 12 : 4 = 3 : 1 Round : Wrinkled = 9+3 : 3+1 = 12 : 4 = 3 : 1
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Mendel’s 2 nd Law: The Law of Independent Assortment - alleles at different loci separate independently of one another - inheritance of single traits is the same in mono- and di- hybrid crosses - explains why there’s a lot of genetic variation in sexually reproducing species MENDEL OBSERVED: MENDEL CONCLUDED: - particles for these traits are inherited independently - chromosomes containing these genes must move (assort) independently
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Mendel’s 2 nd Law In Action Let A = seed color B = seed shape Fig 2.17 a A b B ab AB aB Ab aB Ab ab AB
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allelic combinations in gametes Fig 2.16
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gen380F11StLect3 - GENETICS 380 LECTURE 3: Independent...

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