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Sex chromosomes, chromosome mutations

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

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1 More Genetics More Genetics The Chromosomal Basis of Inheritance Inheritance A cool frog A cool frog Outline Outline circle6 Key concepts circle6 Sex determination circle6 Sex linkage circle6 Errors in chromosomes circle6 Key Terms circle6 Conclusions
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2 Key Concepts: circle6 Each gene has its own position in sequence on a chromosome circle6 Females have XX and Males have XY circle6 The X chromosome has some genes that Y chromosome does not have. circle6 Changes in chromosomes can give rise to genetic abnormalities or disorders Sex Determination in Humans Sex Determination in Humans circle6 Females XX circle6 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 circle6 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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