Lecture 26 Mendel II slides

Lecture 26 Mendel II slides - Mendelian Genetics II The...

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Unformatted text preview: Mendelian Genetics II The Dihybrid Cross 6th ed.; 252-259 7th ed.; 256-264 Do the problems (end of chapter) for practice! Monohybrid Cross Pp x Pp Cross heterozygotes for 1 character (i.e. flower color) Other characters also follow Mendels laws yellow (Y: dominant) or green (y; recessive) round (R: dominant) or wrinkled (r; recessive) Mendel asked; are traits inherited independently of each other? (Does inheriting round vs. wrinkled affect your chances of inheriting yellow vs. green?) P generation : 2 strains that are true-breeding (homozygous) either for BOTH DOMINANT or BOTH RECESSIVE alleles YYRR and yyrr (Yellow, round) (Green, wrinkled) Cross YYRR x yyrr for F1 generation : heterozy- gous for both characters YYRR x yyrr YyRr These are dihybrids . Phenotype: dominant for both characters (yellow/round) Next step: the Dihybrid Cross cross heterozygotes for 2 characters YyRr x YyRr Result: F2 generation Phenotypes: 9/16 yellow, round 3/16 green, round 3/16 yellow, wrinkled 1/16 green, wrinkled Mendel realized these results showed that different traits are inherited independently....
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Lecture 26 Mendel II slides - Mendelian Genetics II The...

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