Lecture 13 - Lecture 13: X-linkage & Sex...

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Unformatted text preview: Lecture 13: X-linkage & Sex Determination Keywords: Key Figures: X chromosome Fig. in Expt. 3A Autosomes (pg. 65) Hemizygous 3.18 Nondisjunction Sex Determination X/A ratio Problems: pg. 69 -S2, S5, C29, C30, C31, C32a, C33, C34, C35, C36, C38, C39, E12, E14 And XX = female XY = male Do chromosomes determine traits? If chromosomes determine traits: Therefore, expect equal number of males and females The question was solved in flies: + P F1 F2 all 2 : 1 X 3 1 + sex XX = female XY = male eye color W + = red w- = white Hypothesis : Chromosomes determine 2 traits Eye color in Drosophila melanogaster (Expt. 3A, pg 65) First cross: It gets worse - the 2nd reciprocal cross: + F1 + F2 X + P 1 : 1 1 : 1 + + all 2 : 1 X 3 1 + X w+ / X w+ X w- /Y X w+ / X w- or X w+ /Y X X w+ X w- X w+ X w+ /X w+ X w+ /X w- Y X w+ /Y X w- /Y + + Using chromosome theory to explain sex-linked eye color P F1 F2 F2: First cross: +...
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This note was uploaded on 05/25/2008 for the course MCDB 2150 taught by Professor Winey,mark during the Winter '06 term at Colorado.

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Lecture 13 - Lecture 13: X-linkage & Sex...

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