BIO 190 Chapter Notes - Chapter 4: Sister Chromatids, Gene Mapping, Centimorgan
16 Sep 2013
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Crucial information is needed to build complex genotypes required for experimental purposes or for commercial applications. It is a useful way of zeroing on structure and function. Geneticists can deduce the evolutionary lineages and genetic mechanisms. Recombination based maps ma0p the genes that have been identified in mutant phenotypes showing single gene-inheritance. Physical maps show tge genes as sengments arranged along the long dna molecule tht constitutes a chromosome. The analyst will only have to worry about the genotype of one of the parents rather than both. Two equally frequent nonrecombinant classes totaling in excess of 50%. Two equally frequent recombinatnt classes totaling less than 50%. When homologous chromosomes pair during meiosis, the chromosomes occasionally break and exchange parts in a process called crossing over. This results in two new combinations called crossover products. The process involves the formation of a crossshaped structure called chiasma, when two dyads unite as a bivalent during meiosis.
