Bio 101 Day 22

Bio 101 Day 22 - November 17, 2009 Chromosomal basis of...

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November 17, 2009 Chromosomal basis of inheritance Linked genes- alleles of loci that are on the same pair of homologous chromosomes- do not undergo independent assortment When we want to study linkage we do not do dihybrid cross Most sensitive test for linkage is two point cross F1 individuals (heterozygous at both loci) are crossed with double homozygous recessvie individuals AaBb x aabb Notation B= normal gray body (wild type) b- black body V- normal long wing (wild type) v-vestigal (short) wing parental type gametes are the ones that produce excess recombinant types are the ones that are deficient- you have new pairs of genes- ones unlike what the parents had, what would give you this new combination of genes? Its called crossing over Crossing Over – takes place in prophase I Every tetrad must have at least one crossing over to keep the tetrad together but that dos not necessiarly meant he crossover happens in the loci you are observing for you experiment Crossing over gives us recombinant types when we have linkage
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Bio 101 Day 22 - November 17, 2009 Chromosomal basis of...

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