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311DCh15 - Ch 15 pg 286 292 297-304 Chromosome theory of...

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Ch. 15 pg. 286 – 292; 297-304 Chromosome theory of inheritance – formed around 1902 by Sutton, Boveri, and others – Mendelian genes have specific loci (positions) on chromosomes, and it is the chromosomes that undergo segregation and independent assortment Wild type – the normal phenotype for a character, such as red eyes in Drosophila Mutant phenotypes – due to alleles assumed to have originated as changes, or mutations, in the wild type allele Morgan found that a specific gene is carried on a specific chromosome (eye color gene on X chromosome) that is evidence of chromosome theory of inheritance Linked Genes – genes located on the same chromosome that tend to be inherited together in genetic crosses Genetic recombination – production of offspring with combinations of traits differing from those found in either parent Parental types – offspring expected to inherit a phenotype that matches one of the parental phenotypes Recombinant types – offspring that have new combinations; when 50% of all offspring are recombinants, geneticists say that there is a 50% frequency of recombination. Recombination frequency is related to the distance between linked genes. Chances of crossing over are equal along all points along a chromosome. The farther apart two genes are, the higher the probability that a crossover will occur between them and therefore the higher the recombinative frequency.
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