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bio lec 11 - It's impossible for all genes to assort...

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β It’s impossible for all genes to assort independently β Each chromosome contains many genes β Genes on the same chromosome are LINKED GENES: Linked Genes tend to be inherited together. They do not act independently during meiosis. This violates Mendel's second law [because not all genes assort independently] β Genes on separate chromosomes will act independently of each other β Recombinant gametes are new combinations of alleles that are not possible in the parental gametes β What do we observe from a testcross of the F1? (class example): cross to homozygous recessive individual; often used to determine genotype of an individual with a dominant phenotype. β Completely Linked Genes: genes are so close together on a chromosome that they are always inherited together [We’ll get no recombinant gametes in an F1 indidivual if parental genes are completely linked genes (i.e., one parent with homozygous recessive genes ccdd and the other with homozygous dominant genes CCDD)] β A punnett square is only useful if you’re looking at independently assorted genes β Results from a testcross tell us if 2 genes are linked. 2-point testcross looks at two
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