BIOL 1090 Lecture Notes - Lecture 8: Thomas Hunt Morgan, Gc-Content, Y Chromosome
26 Feb 2018
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Chromosomes: each species has a characteristic set of chromosomes, comprised of both autosomes (any chromosome that isn"t a sex chromosome) and sex chromosomes. Chromosome vocabulary: chromatin, euchromatin, less condensed, gene expressing, gene rich (high gc content, stains lighter, heterochromatin, more condensed, silenced genes (mythlated, gene poor (high at content, stains darker. 11 to create new banana: odd numbers usually sterile cause they don"t produce gametes. Sex chromosomes in humans: females: xx, males: xy, during meiosis in males, x and y chromosomes pair via common dna at chromosome ends. Sex chromosomes in crickets, cockroaches, etc: females: xx, males: xo. Studies of inheritance of a sex-linked trait rst done by thomas hunt morgan (1910) provided the rst evidence that meiotic behaviour of chromosomes is the basis for mendal"s. Nondisjunction as proof of the chromosome theory of heredity: additional support for the chromosome theory of heredity came from the experiments of.
