A bivalent at the beginning of prophase I is composed of two homologous chromosomes that have already replicated into sister chromatids. Each homologous chromosome consists of two sister chromatids joined by a centromere. The bivalent forms as the homologous chromosomes pair up and undergo synapsis.
bivalent
A bivalent.Sister chromatids are normally joined at the centromere. When homologous chromosomes pair, the two sister chromatids of one chromosome join with the two sister chromatids of the other chromosome. So it is really the joining of non-sister chromatids that is special.The word "bivalent" refers to the temporary combining of the two chromosomes (four chromatids). The bivalent forms in prophase I of meiosis, and is split in anaphase I.
The highly condensed forms of DNA (and proteins) are known as chromosomes.
Answer:chromatin not chromosomes. :DIt Is Chromosomes Not Chromatin:]
In prophase 1 the pair of homologous Chromosomes come together to form a tetravalent or bivalent, which contains four chromatids.
A bivalent at the beginning of prophase I is composed of two homologous chromosomes that have already replicated into sister chromatids. Each homologous chromosome consists of two sister chromatids joined by a centromere. The bivalent forms as the homologous chromosomes pair up and undergo synapsis.
bivalent
A bivalent contains two duplicated homologous chromosomes.
A bivalent.Sister chromatids are normally joined at the centromere. When homologous chromosomes pair, the two sister chromatids of one chromosome join with the two sister chromatids of the other chromosome. So it is really the joining of non-sister chromatids that is special.The word "bivalent" refers to the temporary combining of the two chromosomes (four chromatids). The bivalent forms in prophase I of meiosis, and is split in anaphase I.
One pair of homologous chromosomes. One chromosome in a tetrad is paternally inherited, while the other is maternally inherited. Each chromosome consists of two chromatids.
I n duplicate copy of my w2 for bayada home health
homologous chromosomes
The highly condensed forms of DNA (and proteins) are known as chromosomes.
The five cell cycles are: Telophase (Cell wall pinches in, nuclear membranes are formed, two daughter cells are produced.) Interphase (You can cell the nucleolus, you can see uncoiled chromatin, you cannot see chromosomes.) Prophase (Chromatin uncoils, chromosomes appear, chromosomes duplicate to form sister chromatids, spindle forms between centrioles.) Metaphase (Chromosomes move to the middle of spindles.) Anaphase (Sister chromatids are pulled to opposite sides of cell, each chromatid is now a chromosome.)
DNA forms nucleosomes (beads on the string) by combining histone proteins, nucleosomes condense into chromatins before it forms Chromosomes
Chromosomes replicate during cell division, so are present as a new cell forms.