Mendelism

Third Edition

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Published: 1911
Language: English
Wordcount: 44,044 / 141 pg
Flesch-Kincaid Reading Ease: 48.4
LoC Category: QH
Downloads: 486
Added to site: 2009.05.18
mnybks.net#: 24201
Genre: Science

It is not long since the English language was enriched by two new words—Eugenics and Genetics—and their similarity of origin has sometimes led to confusion between them on the part of those who are innocent of Greek. Genetics is the term applied to the experimental study of heredity and variation in animals and plants, and the main concern of its students is the establishing of law and order among the phenomena {vii}there encountered.

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ar. Except for the relatively rare instances of parthenogenesis a new individual, whether plant or animal, arises as the joint product of two sexual cells derived from individuals of different sexes. Such sexual cells, whether ovules or ova, spermatozoa or pollen grains, are known by the general term of GAMETES, or marrying cells, and the individual formed by the fusion or yoking together of two gametes is spoken of as a ZYGOTE. Since a zygote arises from the yoking together of two separate gametes, the individual so formed must be regarded throughout its life as a double structure in which the components brought in by each of the gametes remain intimately fused in a form of partnership. But when the zygote in its turn comes to form gametes, the partnership is broken and the process is reversed. The component parts of the dual structure are resolved, with the formation of a set of single structures, the gametes.

The life cycle of a species from among the higher plants or animals may be regarded as fall

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