BISC 103xg Lecture Notes - Lecture 7: Chromosome, Woop Woop, Bacteriophage
22 Dec 2016
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Document Summary
Wild-type fruit flies (ggll) were bred with mutant recessive flies (ggll) They found 17% of offspring had recombinant phenotypes (ggll or ggll) This is the frequency of recombination, how often the wild type"s recessive alleles crossed over and mixed with dominant alleles. If recombinations happen less than 50%, they"re on the same chromosome and can only happen from crossing over. The higher it is, the farther apart the alleles are. The y chromosome has testes information, the absence of it allows ovaries. This is pretty consistent in mammals, but there are some weird ones. Insects often have the x-o system, males are missing a second sex one. Birds and fish have it backwards from humans, males have two of the same. Some insects have diploid females and haploid mails. In some reptiles, temperature of eggs determines sex. A gene located on a sex chromosome is a sex-linked gene.
