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Unformatted text preview: UNIT THREE: GENETICS Chapter Fifteen: The Chromos Chapter Fifteen: The Chromos Chapter Fifteen: The Chromos Chapter Fifteen: The Chromos (Text from Biology , 6 th Edition, b The Chrom RE Mendelian Inheritance Has Its P Cycles Connections between Mendels began to be made in around 190 Boveri, and others independentl inheritance inheritance inheritance inheritance, which states that M chromosomes, and it is the chro independent assortment. Morgan Traced a Gene to a Spec Thomas Morgan was the first to chromosome. Morgans Choice of Experimenta Morgan chose a spe growing on fruit. A mature in two week distinguishable with X chromosomes, wh normal phenotype f Alternatives to the assumed to have or Discovery of Sex Lin After Morgan discovered a male The resulting offspring had red e he bred the first generation to e However, the white-eye trait on affecting his white-eyed mutan there was no corresponding eye was recessive, females could on chromosomes. Since a male onl type allele to offset the recessiv Sex Sex Sex Sex-linked genes linked genes linked genes linked genes are those loca somal Basis of Inheritance somal Basis of Inheritance somal Basis of Inheritance somal Basis of Inheritance by Campbell and Reece) mosomal Basis of Inheritance (Chapter Fifte ELATING MENDELISM TO CHROMOSOMES Physical Basis in the Behavior of Chromosomes D s discoveries and chromosomal behavior 00. In 1902, Walter Sutton, Theodor ly formed a chromosome theory of chromosome theory of chromosome theory of chromosome theory of Mendelian genes have specific loci on omosomes that undergo segregation and cific Chromosome o associate a specific gene with a specific tal Organism ecies of fruit fly, Drosophila melanogaster , which single mating of fruit flies produces hundreds of ks. Additionally, fruit flies only have four pairs o h even a light microscope. Female fruit flies hav hile males have one X and one Y chromosome. H for a character is called the wild type wild type wild type wild type, such as re wild type are called mutant phenotypes , becaus riginated as changes or mutations in the wild-typ inkage e fly with white eyes, he mated it with a red-eye eyes, which suggested that red eyes were domin each other, he found the usual 3:1 phenotypic rat nly showed up in males. Morgan deduced that t nt was located exclusively on the X chromosome e-color locus on the Y chromosome. Since the m nly have white eyes if she received the allele on t ly received one copy of the gene, there would be ive allele. cated on a sex chromosome. 1 een) During Sexual Life h feeds on the fungi f offspring that can of chromosomes, easily ve a homologous pair of He established that the red eyes in Drosophila ....
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