Lecture 26 Mendelian Genetics Part II Slides

Lecture 26 Mendelian Genetics Part II Slides - Mendelian...

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Mendelian Genetics II The Dihybrid Cross Complications in Mendelian Genetics 6 th ed.; 252-259 7 th ed.; 256-264 8 th ed.; 268-275 Do the problems (end of Chapter 14) for practice!
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Monohybrid Cross Pp x Pp Cross heterozygotes for 1 character (i.e. flower color)
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Other characters also follow Mendel’s laws yellow (Y: dominant) or green (y; recessive) round (R: dominant) or wrinkled (r; recessive)
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Mendel asked; are traits inherited independently of each other? (Does inheriting “round” vs. “wrinkled” affect your chances of inheriting “yellow” vs. “green”?)
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P generation : 2 strains that are true-breeding (homozygous) either for BOTH DOMINANT or BOTH RECESSIVE alleles YYRR and yyrr (Yellow, round) (Green, wrinkled)
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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)
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Next step: the Dihybrid Cross cross heterozygotes for 2 characters YyRr x YyRr
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Result: F2 generation Phenotypes: 9/16 yellow, round 3/16 green, round 3/16 yellow, wrinkled 1/16 green, wrinkled
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results showed that different traits are inherited independently. This is the
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Lecture 26 Mendelian Genetics Part II Slides - Mendelian...

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