BIOL 117 Chapter Notes - Chapter 15: Thomas Hunt Morgan, Homologous Chromosome, Pea

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11 Jan 2019
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Morgan"s choice of experimental organism: mendel chose the garden pea because a number of distinct variables were available, morgan chose a species of fruit fly, drosophila melanogaster, a common insect that feeds on the fungi growing on fruit. Correlating behavior of a gene"s alleles with behavior of a chromosome pair: morgan mated his white white-eyed male fly with a red-eyed female. All the f1 (1st generation) had red eyes, suggesting that the wild type allele is dominant. Meaning, the white eye gene must be recessive: the 3:1 phenotypic ratio among the 1st generation, there was a surprising assign result: the white-eye trait showed up only in makes. All the females has red eyes whole half the males had red eyes and half has white eyes. Therefore, morgan concluded that somehow a fly"s eye color was linked to its sex: a female fly has two x chromosomes (xx), while a male fly has an x and a y (xy).

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