01:119:115 Lecture Notes - Lecture 13: Thomas Hunt Morgan, Mendelian Inheritance, Wild Type

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: A Keating

Document Summary

Chromosomal theory of inheritance: morgan and d. melanogaster: 1902: scientist began to develop the chromosome theory of inheritance : genes have specific loci on chromosomes, chromosomes undergo segregation & independent assortment. Evidence that chromosomes are the location of mendel"s heritable factors . A convenient organism for genetic studies: 100"s offspring, eggs every two weeks. Trait is named after mutation: wild type phenotype most in population. Ex: red eyes red eyes = w : mutant phenotype. Ex: white eyes (first mutant found in male) white eyes = w: correlating allelic and chromosome behavior: Results: same phenotypic ratio as mendel"s pea plants. Inheritance patterns of sex chromosomes: sex chromosomes. Quick chromosome review: autosomes: 22 pairs (in humans) homomorphic (same shape, sex chromosome: 1 pair heteromorphic - not morphologically similar meiosis, some regions synapse. Humans 2 sex chromsomes: x and y. Xx genotype so all eggs have an x.