8 (1).ppt - The Basis of Heredity Genes located on different chromosomes assort independently during metaphase 1 It holds true as long as the traits are

8 (1).ppt - The Basis of Heredity Genes located on...

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The Basis of Heredity
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Genes located on different chromosomes assort independently during metaphase 1 It holds true as long as the traits are located on different chromosomes
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Genes “from mom and dad” segregate during meiosis (anaphase I)
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Is a cross involving two traits It involves crossing two individuals that are heterozygous for both traits E.g. YyRr x YyRr
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It produces a 9:3:3:1 phenotypic ratio Uses a modified Punnett square
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It assumes that 2 laws hold true: The law of independent assortment The law of segregation
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He studied the inheritance of seed color and seed shape
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The allele for: yellow seeds ( Y ) is dominant to green seeds ( y ) round seeds ( R ) is dominant to wrinkled seeds ( r ).
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Both plants were true breeding: YYRR X yyrr (parental Generation) True breeding for: Yellow round seeds True breeding for: green wrinkled seeds
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All the F1 members were YyRr (yellow and round) The gametes produced from the FI (in equal amounts) were as follows: YR, Yr, yR, yr
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Each gamete receives 2 chromosomes: One chromosome carries the gene for seed shape E.g. R or r One chromosome carries the gene for seed colour E.g. Y or y
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Mendel had the FI self pollinate F2 produced a 9:3:3:1 phenotypic ratio
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9/16 yellow round seeds……( YYRR, YyRR, YYRr, YyRr ) 3/16 green round seeds……( yyRR, yyRr ) 3/16 yellow wrinkled seeds….. ( YYrr, Yyrr ) 1/16 green wrinkled seeds….( yyrr )
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Each character appeared to be inherited independently.
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