Chapter 15

Chapter 15 - Chapter 15 The chromosomal basis of...

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Chapter 15 – The chromosomal basis of inheritance - The chromosomal Theory of Inheritance o Genes have specific loci (location) on chromosomes and chromosomes undergo segregation and independent assortment - Chromosomal linkage o Thomas Hunt Morgan Fruit flies Drosophilia melanogaster 8 chromosomes XX ( females) x XY ( male) o Sex-linkage: genes located on a sex chromosome Located on the X SRY – sex determining region o Linked genes: Genes located on the same chromosome that tend to be inherited - Genetic recombination Crossing over: Genes do not assort independently of each other o Genetic maps The further apart 2 genes are, the higher the probability that a crossover will occur between and therefore the higher the recombination frequency o Linkage maps Best guess Genetic map based on recombination frequencies Nothing happens when a gene crosses over than recrosses over - Human sex- linkage o SRY gene- Gene on Y Chromosome that triggers the development of testes
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Chapter 15 - Chapter 15 The chromosomal basis of...

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