Sex determination and linkagespr08

Sex determination and linkagespr08 - Sex determination and...

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Sex determination and Sex-linked Charateristics Chapter 4 Chromosomal Theory of Inheritance o Walter Sutton (see p. 53) there are 2 copies of each gene and there are 2 copies of each chromosome chromosome complement is unchanged one generation to next (just like Mendel's "units") chromosomes segregate (just like Mendel's "units") random union of chromosomes at fertilization (just like Mendel's "units") Experimental Data o Thomas Hunt Morgan found white-eyed males fig. 4.12, p.85
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An aside - Nomenclature for Drosophila Genetics o Wild-type allele: Allele that is found in high frequency in a population (>1%) Denoted with a superscript + o Mutant allele: Allele found in low frequency Denoted with no symbol. Recessive mutation Gene symbol is in lower case Dominant mutation Gene symbol is in upper case Nomenclature examples o Wing variations Cy – a dominant mutation for curly wing vg – a recessive mutation for vestigial wing Human X-linked Inheritance o Red- green color blindness x-linked recessive X c trait
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Sex determination and linkagespr08 - Sex determination and...

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