What do you mean by a bivalent chromosome?
A bivalent is one pair of chromosomes (sister chromatids) in a tetrad. A tetrad is the association of a pair of homologous chromosomes (4 sister chromatids) physically held together by at least one DNA crossover.
What is Bivalents in biology?
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)
Is the meaning of bivalent?
(Entry 1 of 2) 1 chemistry : having a valence of two : divalent bivalent calcium. 2 genetics : associated in pairs in synapsis bivalent chromosomes. 3 immunology : having two combining sites a bivalent antibody capable of binding to two molecules of an antigen.
How many chromosomes are in 4 Bivalents?
two chromosomes
Chromosomal condensation allows these to be viewed in the microscope. Note that the bivalent has two chromosomes and four chromatids, with one chromosome coming from each parent. The nuclear membrane disappears.
What is another word for bivalent?
In this page you can discover 5 synonyms, antonyms, idiomatic expressions, and related words for bivalent, like: valent, double, divalent, multivalent and univalent.
What is meant by bivalent metal?
adjective. Chemistry. having a valence of two. having two valences, as aluminum with valences of two and three.
What is difference between bivalent and tetrad?
Bivalent and tetrad are two closely related terms used to describe chromosomes in their different stages. Thus, the main difference between bivalent and tetrad is that bivalent is the group of two homologous chromosomes whereas tetrad is the group of four sister chromatids inside the homologous chromosome pair.
Is there a YY chromosome?
Sometimes, this mutation is only present in some cells. Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This condition is also sometimes called Jacob’s syndrome, XYY karyotype, or YY syndrome.
What monovalent means?
1 : having a valence of one. 2 : having specific immunologic activity against a single antigen, microorganism, or disease a monovalent vaccine.