01:119:115 Chapter Notes - Chapter 15: X Chromosome, Heterogametic Sex, Zygosity

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~1902: scienists began to develop the chromosome theory of inheritance : genes have speciic loci on chromosomes, chromosomes undergo segregaion and independent assortment. October 14, 2014: morgan"s choice of experimental organism. Morgan chose to study drosophila melanogaster, a common species of fruit ly. A convenient organism for geneic studies: they produce 100"s ofspring, a generaion every two weeks, they have only four pairs of chromosomes, 3 pairs of autosome, 1 pair sex chromosomes. Traits studied in drosophila melanogaster: wild type. Phenotype for character most commonly observed in populaion. Ex: while eyes (irst mutant found in male: for a given character, gene given symbol for 1st mutant ex: allele for. Red eyes = w: correlaing behavior of a gene"s alleles with. Results: same phenotypic raio as mendel"s pea plants. The f2: a 3:1 red to white eye raio, but only males had white eyes. Morgan determined that the white-eyed mutant allele must be located on the x sex chromosome.

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