BIOL 111 Chapter Notes - Chapter 15: Embryology, Y Chromosome, Wild Type

• School: La Sierra University
• Department: Biology
• Course: BIOL 111
• Professor: Jesse Grismer

Document Summary

The first solid evidence associating a specific gene with a specific chromosome came from thomas hunt, and embryologist. Several characteristics make fruit flies a convenient organism for genetic studies: they produce many offspring, a generation can be bred every two weeks, they only have for pairs of chromosomes. Morgan noted wild type, or normal, phenotypes that were common in the fly populations. Traits alternative to the wild type are called mutant phenotypes. Morgan determined that the white-eyed mutant allele must be located on the x chromosome. Morgan"s finding supported the chromosome theory of inheritance. Concept 15. 2 sex-linked genes exhibit unique patterns of inheritance. In humans and many other animals, there is a chromosomal basis of sex determination. In humans and other mammals, there are two varieties of sex chromosomes: a larger x chromosome and a smaller y chromosome. Only the ends of the y chromosome have regions that are homologous with corresponding regions of the x chromosome.