lecture 15 cont - More Genetics The chromosomal basics of...

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More Genetics: The chromosomal basics of inheritance. Gene mutations can cause the dislocation of organs Concepts Each gene has its own position in sequence on a chromosome Females have XX and Males have XY The X chromosome has some genes that Y chromosome does not have. Changes in chromosomes can give rise to genetic abnormalities or disorders Sex determination o Females XX, Males XY,, female eggs are 8500 larger than one sperm. o Determination by sperm cells. o X-0 system (some insects including roaches and grasshoppers) Males no sex chromosomes o Z-W (birds, some fishes, and insects Sex determination by eggs o Haploid-diploid system (bees and ants) Females from fertilized eggs Males no father Sperm 32, eggs 16. o Humans Human embryo and sex organ development XY embryo, 8 weeks old – before 8 weeks hard to tell if baby is boy or girl Sex determination region of Y – SRY Gene SRY on Y chromosome governs development of testes Gene SRY codes for a protein that regulates many other genes Early human embryo Duct system in early human embryo
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o Develop into make or female reproductive organs o After 8 weeks is called fetus 9 weeks old o
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