BISC207 Lecture Notes - Lecture 7: Thomas Hunt Morgan, Phenotype, Y Chromosome

• School: University of Delaware
• Department: Biological Sciences
• Course: BISC207
• Professor: David Raden

Document Summary

Simple inheritance continued and variance from complete dominance. Genes must be physically close to avoid crossingover. Crossing over gives results that look like independent assortment. Does not follow principle of independent assortment. In 1910, thomas hunt morgan found that, in the fruit fly, genes were present on chromosomes and that the x chromosome carried its own genes. Genes in the x-chromosome are called x-linked genes. In his work, he found a mutant male fruit fly with white eyes. He used the mutant male and crossed him with a red-eyed female. The f1 generation produced all red-eyed offspring, which was expected of a recessive mutation. When the f1 generation was crossed, he found that the white-eyed flies returned to the population. This too was expected, but what was not expected was that the white-eyed offspring were male and that, of the males in the f2 generation, half had red eyes and the other half had white eyes.