منابع مشابه
Sex determination
struggled for years with parasites that evolve resistance to commonly used drugs. Why should it be any different in animals? Yet as far as we know, no study has ever looked at whether parasites become resistant to the chemicals in the plants that hosts use for protection, though in the Drosophila example referenced above, ethanol did not negatively affect larvae of specialist wasps as strongly ...
متن کاملSex determination
Of all the differences that distinguish people, the most obvious and most intriguing one is their sex. The relationship between males and females has had a profound influence on human civilization, causing wars and societal up heavals, and inspiring countless works of art, music and literature. For as long as humans have both struggled with and enjoyed the existence of the two sexes, they have ...
متن کاملI-40: The Genetic Complexities of Human Sex-Determination
Background - MaterialsAndMethods N;Results N;Conclusion N;
متن کاملDetermination of Chromosomal Sex ‡
The sex of an individual may be defined in three different ways: a. The type of gonad present b. General anatomical appearance and psychological orientation c. Genetic factors as determined by the presence of the XX or XY chromosomes. If uniformity is absent or equivocal in these characteristics, the decision as to whether an individual should be classified as male or female is difficult and is...
متن کاملSex determination methods in guppy (Poecilia reticulat)
Guppy, Poecilia reticulate, is a member of the Poecilidae family. This species is viviparous and one of the most popular ornamental fish in the world, whose phenotype is usually determined during the last ten days of pregnancy. However, most differentiation and development of secondary sexual traits are formed during adolescence, i.e. about 16 weeks after birth. These secondary characteristics ...
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ژورنال
عنوان ژورنال: Nature
سال: 1934
ISSN: 0028-0836,1476-4687
DOI: 10.1038/133579a0