BIO207H5 Lecture Notes - Lecture 7: Xyy Syndrome, Vas Deferens, Uterus
Document Summary
The chromosome theory of heredity proposes that genes are carried on. Sutton and boveri proposed that chromosome behavior in meiosis mirrors hereditary transmission of genes: morgan studied fruit flies, drosophila melanogaster, to test mendel"s rules on a natural, rather than domesticated, species. The term (cid:862)wild type(cid:863) signifies the phenotype most common in a population. Morgan"s results: over several years, morgan"s lab members found numerous phenotypic variants and analyzed these in controlled crosses, he concluded from his results that genes were carried on chromosomes. X-linked inheritance: after studying other insects, stevens concluded that sex-dependent hereditary differences are due to the presence of two x chromosomes in females and an x and a smaller y chromosome in males. Sex-linked inheritance refers to transmission of traits on sex chromosomes. In 1910, morgan"s experiments with flies validated steven"s conclusions. X and y chromosomes: nettie stevens studied chromosome differences between male and female beetles (tenebrio molitor)
