IMED2004 Study Guide - Final Guide: Mendelian Inheritance, Meiosis
Document Summary
There is a distance between the alleles which can vary (different) and this is = linkage genes. Genes located close enough together on a chromosome that the tend to be inherited together. When two genes are close together on the same chromosome pair, they do not assort independently. (takes place between genes on different chromosomes random segregation of chromosomes mendel discovered during dihybrid crosses) Number of recombinant types in progeny is 50% Number of parental types in progeny is 50% Intrachromosomal recombination (genes located on same chromosome) Linked genes are prevented from assorting independently during meiosis. Result is that the number of recombinants is less than 50% crossing over produces two reciprocal products so two classes are always equal in number. For closely linked genes, cross over doesn"t occur every meiosis. In meiosis, single crossover, gametes are recombinants, gametes nr (single. Crossover affects only 2 of 4 chromatids). % recombinant gametes = percentage of meiosis in which cross over occurs.
