Introduction to Genetic Analysis 52

Introduction to Genetic Analysis 52 - 44200_02_p27-72...

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51 2.2 Sex chromosomes and sex-linked inheritance First cross Red female XX w 1 1 White male Red male White female XY P Second cross X 1 Y ww P 1 1 1 F 1 Male gametes Male gametes Female gametes 1 1 F 1 1 1 1 1 1 1 F 2 1 1 1 F 2 Red female Red female Red male Female gametes Red female Red male White male Red female Red male White female White male White male Male gametes Female gametes Male gametes Female gametes 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 4 1 4 1 4 1 4 1 2 1 2 1 4 1 4 Red female 1 4 1 4 1 2 1 2 Figure 2-24 Reciprocal crosses between red-eyed (red) and white-eyed (white) Drosophila give different results. The alleles are X-linked, and the inheritance of the X chromosome explains the phenotypic ratios observed, which
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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