BIOL 2111 Chapter Notes - Chapter 3: Oocyte, Antonie Van Leeuwenhoek, Corpus Luteum
13 Nov 2016
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Document Summary
The nature of the specific link between sex and reproduction remained a mystery until. Anton van leeuwenhoek, one of the earliest and most astute of microscopists, discovered in 1667 that semen contains spermatozoa. In the 1880s, a newly discovered combination of organic and inorganic dyes revealed the existence of the long, brightly staining threadlike bodies, within the nucleus that we call chromosomes. In embryonic cells, the chromosome threads spilt, lengthwise in 2 just before cell division. Fertilization: the union of haploid gametes to produce diploid zygotes. Gametes and other cells that carry only a single set of chromosomes are called haploid. Zygotes and other cells carrying 2 matching sets are diploid. Microscopic studies suggest that the nuclei of egg and sperm contribute equally to the offspring by providing a single set of n chromosomes. The zygote formed by the union of haploid gametes is diploid (2n) Species variations in the number and shape of chromosomes.
