bio notes2

bio notes2 - Sex linkage Autosomes vs sex linked genes Sex...

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Sex linkage Autosomes vs sex linked genes Sex linked genes are carried on the sex chromosomes Chromosomal sex determination XX (homogametic), XY (heterogametic) XX, X O ZZ, ZW (birds) Father determines the sex of the child Sex or X linked traits Allele occurs on one of the sex chromosomes In humans for the most part we are concerned with X linked traits Mother determines whether son displays an X linked trait X linked recessive allele for color blindness Two alleles N=dominant allele N=recessive allele Phenotypes XNXN-normal vision female XNXn-normal vision female XnXn-color blind female XNY-normal vision male XnY-color blind male Human characteristic Hairy Pinnae-Y linked trait (passed from father to son) Y chromosomes-78 genes TDF gene, testis, determining factor Hairy ear rims X chromosomes-X linked traits (passed from mother to son) Primarily males are affected 1098 genes 99 encode proteins expressed in testis and in various tumor types 168 Mendelian diseases have been explained->mutations in 113 X linked
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This note was uploaded on 08/22/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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bio notes2 - Sex linkage Autosomes vs sex linked genes Sex...

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