Chromosome Z - translation to french
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Chromosome Z - translation to french

CHROMOSOMAL SYSTEM THAT DETERMINES THE SEX OF OFFSPRING IN BIRDS, SOME FISH, SOME INSECTS AND CRUSTACEANS, AND SOME REPTILES
WZ sex-determination system; Z chromosome; W chromosome; ZW sex determination
  • ZW sex determination in birds (as exemplified with chickens)

Chromosome Z      
n. z chromosome

Definition

Z
Z1 [z?d, US zi:]
(also z)
¦ noun (plural Zs or Z's)
1. the twenty-sixth letter of the alphabet.
2. denoting the next after Y in a set of items, categories, etc.
3. (usu. z) the third unknown quantity in an algebraic expression.
denoting the third axis in a three-dimensional system of coordinates.
4. used in repeated form to represent buzzing or snoring.
Phrases
catch some (or a few) Zs N. Amer. informal get some sleep.
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Z2
¦ abbreviation Zambia (international vehicle registration).
¦ symbol Chemistry atomic number.

Wikipedia

ZW sex-determination system

The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors including Komodo dragons. It is also used in some plants where it has probably evolved independently on several occasions. The letters Z and W are used to distinguish this system from the XY sex-determination system. In this system, females have a pair of dissimilar ZW chromosomes, and males have two similar ZZ chromosomes.

In contrast to the XY sex-determination system and the X0 sex-determination system, where the sperm determines the sex, in the ZW system, the ovum determines the sex of the offspring. Males are the homogametic sex (ZZ), while females are the heterogametic sex (ZW). The Z chromosome is larger and has more genes, like the X chromosome in the XY system.