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Dictionary » B » Bivalent

Bivalent

Definition

noun, plural: bivalents

(genetics) A pair of homologous chromosomes in synapsis during meiosis.

adjective

(chemistry) Of, or having a valence of two; divalent.

(genetics) Of, or pertaining to the bivalent structure or the association of the two homologous chromosomes during meiosis.


Supplement

In genetics, a bivalent refers to the two homologous chromosomes that have already joined or paired together in synapsis at Prophase I of Meiosis I.

Word origin: bi- (two) + valent from valence
Related forms: bivalence (noun)

Compare: univalent, polyvalent

See also: valence

Related terms:


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Questions about Biology's term

... So during metaphase the two halves of a copied chromosome are both chromatids. At anaphase these separate and become two new chromosomes. Bivalent: A chromosome that has duplicated to form two sister chromatids still held together at the centromere. Tetrads: Group of four chromatids at ...

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by Jesse2504
Tue Jun 23, 2009 6:25 am
 
Forum: General Discussion
Topic: Questions about Biology's term
Replies: 6
Views: 324

Questions about Biology's term

What is the difference between chromatid, chromatin and chromosome? It also state that bivalent is visible under microscope as a 4 part structure called tetrad. Is this means that bivalent is also tetrad? My text book state that homologous chromosome consist of 2 chromosome(1 ...

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by dorevidadamn
Sun Jun 21, 2009 2:53 am
 
Forum: General Discussion
Topic: Questions about Biology's term
Replies: 6
Views: 324

Questions about Biology's term

Can someone tell me the meaning of some biology's terms? The terms are as follow: Chromosome Homologous Chromosome Chromatin Chromatid Bivalent Tetrad But not least tell me the differentiate between them. I hope you can label all of them in picture so that I can understand well. Thanks Very ...

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by dorevidadamn
Sat Jun 13, 2009 3:34 am
 
Forum: General Discussion
Topic: Questions about Biology's term
Replies: 6
Views: 324

Re: Ploidy Number

... chromosomes, the diploid number should be four, right? Also, if there is an organism with a haploid number of X then what would the number for a bivalent, sister chromatid, and a nucleus after DNA replication be? The whole thing is wrong. Vocabulary: Haploid – half of total number of chromosomes ...

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by Cat
Fri Mar 07, 2008 6:22 pm
 
Forum: Cell Biology
Topic: Ploidy Number
Replies: 3
Views: 1309

Ploidy Number

... chromosomes, the diploid number should be four, right? Also, if there is an organism with a haploid number of X then what would the number for a bivalent, sister chromatid, and a nucleus after DNA replication be?

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by Tokophyra125
Mon Mar 03, 2008 2:43 am
 
Forum: Cell Biology
Topic: Ploidy Number
Replies: 3
Views: 1309
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