powerpoint 4 -- more genetics - chromosome mutations

powerpoint 4 -- more genetics - chromosome mutations - Sex...

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Sex Chromosomes; Chromosome Mutation – More Genetics The Chromosomal Basis of Inheritance Outline: 1. Key concepts 2. Sex determination 3. Sex linkage 4. Errors in chromosomes 5. Key Terms 6. Conclusions Key Concepts: 1. Each gene has its own position in sequence on a chromosome 2. Females have XX and males have XY 3. The X chromosome has some genes that Y chromosome does not have. 4. Changes in chromosome can give rise to genetic abnormalties or disorders. Sex Determination in Humans: Females XX; Males XY 1. X-0 system (some insects including roaches and grasshoppers) Males no sex chromosomes Males: 22 + X Females: 22 + XX 2. Z-W system (birds, some fishes, and insects) Sex determined by eggs Males: 76 + ZZ Females: 76 + ZW 3. Haploid-diploid system (bees and ants)
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Females from fertilized eggs; males no father Males: 16 (haploid) Females: 32 (diploid) Human Embryo and Sex Organ Development XY embryo: 8 weeks old Gene SRY on Y chromosome governs development of testes
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This note was uploaded on 03/25/2009 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas at Austin.

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powerpoint 4 -- more genetics - chromosome mutations - Sex...

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