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Cohesin.
a protein complex that forms a ring around the pair.
It is composed of four subunits, called a globular head, and a twisted chain.
3 of these globular heads connected togethor (diagramaically) forms a triangle.
(the four subunits of each chain are the red dots.)
My university is researching into the exact mechanism that is why there is not yet widely spread pictures of it.
This complex keeps the homologous chromosome pairs togethor after replication.
It also promotes the attatchment on a spindle and repairs an damage from recombination.
It is broken open at anaphase.
What else can I help you with?
What is the difference between Chiasma and Chiasmata?
Chiasma refers to the physical site of crossover between homologous chromosomes during meiosis, facilitating genetic recombination. Chiasmata are the visible manifestations of chiasmata, appearing as X-shaped structures that hold homologous chromosomes together before they separate during meiosis.
Do asexual organisms have homologous chromosomes?
Asexual organisms can have homologous chromosomes, particularly if they are diploid, meaning they have two sets of chromosomes—one from each parent. In such organisms, homologous chromosomes carry the same genes, though they may have different alleles. Asexual reproduction, such as binary fission or budding, typically involves the replication of genetic material before cell division, but the presence of homologous chromosomes is dependent on the organism's genetic structure. In contrast, haploid organisms, which have only one set of chromosomes, do not possess homologous chromosomes.
How many pairs of homologous chromosomes are found in human body cells?
Human cells have 23 homologous pairs. They also must go through meiosis before that. Females have 2 X chromosomes, while Males have an X and a Y chromosome. That's why the males cells decide the gender of the child.
In meiosis how often does cells duplicate their chromosomes?
In meiosis, cells duplicate their chromosomes only once, during the S phase of interphase, before the process begins. This duplication results in homologous chromosomes, each consisting of two sister chromatids. The subsequent two rounds of cell division (meiosis I and meiosis II) separate these chromatids and homologous pairs, leading to the formation of four haploid gametes.
How do chromosomes pair up during the process of mitosis or meiosis?
During mitosis, chromosomes pair up by replicating and aligning themselves in the center of the cell before separating into two identical sets. In meiosis, chromosomes pair up in homologous pairs, exchange genetic material, and then separate into four non-identical sets of chromosomes.
The pairing of homologous chromosomes before nuclear division happens in what type of cell division?
The pairing of homologous chromosomes before nuclear division occurs in meiosis. Meiosis is a type of cell division that results in the formation of sex cells (sperm and egg cells) with half the number of chromosomes as the parent cell.
List the phases of meiosis 1 and meiosis 2 and describe the events characteristic of each phase?
Interphase phase is the phase before meiosis begins, genetic material is duplicated. The first division of meiosis is prophase 1 which is duplicated chromatin condenses. Each chromosome consists of two, closely associated sister chromatids. Crossing over can occur during the latter part of this stage. Metaphase 1 is homologous chromosomes align at the equatorial plate. Anaphase 1 homologous pairs separate with sister chromatids remaining together. Telophase 1 two daughter cells are formed with each daughter containing only one chromosome of the homologous pair.
What is the area in which homologous chromosomes are joined?
If you mean the area of the cell, then they line up along the Metaphase (or equatorial) plate before being pulled apart. Or perhaps you mean the centromere - the bit that connects two homologous pairs?
What phase in meiosis does the double stranded chromosomes move to the center of the cell and separate?
The phase you are referring to is metaphase I. In metaphase I of meiosis, homologous pairs of chromosomes line up at the cell's equator before they are separated and pulled to opposite ends of the cell during anaphase I.
What major event happens just before prophase 1 of meiosis but does not occur before prophase 2?
Crossing over of genetic material occurs just before prophase 1 of meiosis, where homologous chromosomes exchange segments. This event does not occur before prophase 2 because homologous chromosomes have already separated during meiosis I.
Is duplication of paired chromosomes in the first stage of meiosis?
Yes duplication of chromosomes occurs during the first stage of meiosis or during prophase.
Does the DNA must occur before a cell can divide?
Before a cell can separate, it has to unravel its chromosomes and clone all its DNA
