bivalent

/bahy-vey-luhnt, biv-uh-/US // baɪˈveɪ lənt, ˈbɪv ə- //UK // (baɪˈveɪlənt, ˈbɪvə-) //

二价,二价的,二价物,二元

Definitions

adj.形容词 adjective

1
- : Chemistry. having a valence of two.having two valences, as aluminum with valences of two and three.
- : Genetics. pertaining to associations of two homologous chromosomes.

n.名词 noun

1
- : Genetics. a pair of bivalent chromosomes, especially when pairing during meiosis.

For the chromosomes of the heterotype mitosis arise by the looping round, not opening out, of the bivalent chromosomes.
Monoxide, mo-nok′sīd, n. an oxide containing a single oxygen atom in combination with two univalent atoms or one bivalent atom.
Figure 145 is a prophase showing the bivalent chromosomes still connected by linin fibers.
In Tenebrio molitor, the unequal pair behaved in every respect like the other bivalent chromosomes.
Bouquet stage from iron-hæmatoxylin preparations, showing the heterochromosome bivalent (x).