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Chapter12,13,14,15

Chapter12,13,14,15 - Dakotah Forell Chapter 12,13,14,15 8...

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Dakotah Forell Chapter 12,13,14,15 9/22/10 8. Gene locus -Generally a specified location for a given gene on a given chromosome. (From work by Thomas Hunt Morgan on Drosophila) 9. Gene linkage -Genes located on the same chromosome. They do not sort independently 10. Sex-linked traits -those carried on the sex-determining chromo-somes. Can sometimes be expressed in only one sex 11. Crossing over (in meiosis) -Sister chromosomes can ex-change whole sections of chromosomes during meiosis. Leads to genetic recombination. Increases variability 12. Concept of multiple alleles -One type of blood groups has 3 alleles, which gives rise to 6 possible genotypes (i.e. AA AB AO BB BO OO) 13. Pleiotropy = multiple effects of a single gene e.g. Marfan’s Syndrome & Cystic fibrosis 14. Polygene inheritance = traits determined by several genes at different loci (e.g. Height in humans gives a normal distribution) -How do genes produce their effects?? Synthesis of proteins (functioning enzymes) Complete dominance Tyrosine (amino acid)
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