| 书目名称 | Sex Chromosomes and Sex-Linked Genes | | 编辑 | Susumu Ohno | | 视频video | | | 丛书名称 | Monographs on Endocrinology | | 图书封面 |  | | 描述 | Natural selection operates among individual organisms which differ in their genetic constitution. The degree of hereditary variability within a species is greatly enhanced by cross-fertilization. Indeed, the mechanism of sexual reproduction occurred very early in evolution, for it is seen today even in bacteria. In Escherichia coli, fertilization occurs by passage of the single chromosome from the male into the female bacterium (LEDERBERG, 1959). In multicellular organisms, the separation of germ from soma, and the production of haploid gametes became mandatory. The gametes were of two types. One, extremely mobile, was designed to seek out and penetrate the other, which loaded with nutrients, received the mobile gamete and intiated the development of a new individual. The foundation for true bisexuality was thus laid. In the primitive state of bisexuality, whether an individual is to be a sperm-producing male or an egg-producing female appears to be decided rather haphazardly. In the worm, Banelia viridis, the minute males are parasites in the female. Larvae that become attached to the proboscis of an adult female become males, while unattached larvae sink to the bottom and become | | 出版日期 | Book 1966 | | 关键词 | Chromosomes; bacteria; chromosome; genes; natural selection; parasites; reproduction; sex; sexuality | | 版次 | 1 | | doi | https://doi.org/10.1007/978-3-642-88178-7 | | isbn_softcover | 978-3-642-88180-0 | | isbn_ebook | 978-3-642-88178-7Series ISSN 0077-1015 | | issn_series | 0077-1015 | | copyright | Springer-Verlag Berlin · Heidelberg 1966 |
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发表于 2025-3-21 18:26:29
