Sex chromosomes, chromosome mutations

Sex chromosomes, chromosome mutations - More Genetics The...

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1 More Genetics More Genetics The Chromosomal Basis of The Chromosomal Basis of Inheritance Inheritance A cool frog A cool frog Outline Outline c Key concepts c Sex determination c Sex linkage c Errors in chromosomes c Key Terms c Conclusions
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2 Key Concepts: c Each gene has its own position in sequence on a chromosome c Females have XX and Males have XY c The X chromosome has some genes that Y chromosome does not have. c Changes in chromosomes can give rise to genetic abnormalities or disorders Sex Determination in Humans Sex Determination in Humans c Females XX c Males XY Sex Determination Sex Determination 1. X-0 system (some insects including roaches and grasshoppers) Males no sex chromosomes 2. Z-W system ( birds, some fishes and insects) Sex determined by eggs 3. Haploid-diploid system (bees and ants) Females from fertilized eggs Males no father
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3 Human Embryo and Sex Human Embryo and Sex Organ Development Organ Development c XY Embryo 8 Weeks old Gene SRY on Y chromosome governs development of testes Gene SRY codes for a protein that regulates many other genes Early Human Embryo
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This note was uploaded on 02/16/2010 for the course BIO 49970 taught by Professor Chinnery during the Spring '10 term at University of Texas at Austin.

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Sex chromosomes, chromosome mutations - More Genetics The...

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