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What keeps homologous pairs of chromosomes together before they separate?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 12y ago
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What is the name given to the points along the length of homologous chromosomes where they remain held together in metaphase 1 just before their complete separation?
Centrioles
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.
What condenses into an X shape before mitosis?
Chromatids condense into an X shape before mitosis. Chromatids are identical strands of chromosomes. After duplication there are 12 chromatids that are in 3 pair of homologous chromosomes.
The pairing of homologous chromosomes before nuclear division happens in what type of cell division?
only in meosis
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?
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
What do chromosomes and meiosis have to do with each other?
Each chromosome makes a copy The homologous chromosomes form pairs. Chromosomes line up in the middle of the cell. Chromosomes condense or shorten up before cell division begins 1 of those 4
During what phase do maternal and paternal homologous chromosomes pair?
Two pairs of homologous chromosomes line up and form a tetrad near the beginning of prophase I of meiosis. The tetrads then perform the crossing over and recombination process before migrating to the cell equator.
How many chromosomes do a fertilized egg of a human have?
After fertilization all normal human cells contain the same number of chromosomes as the cells of an adult human - 23 pairs of chromosomes, for a total of 46 chromosomes. Before fertilization the ovum contains only 23 chromosomes. A second 23 chromosomes are provided by the sperm during fertilization.
What happens to chromosomes before the nuclear membrane breaks down in mitosis?
Before the nuclear envelope of a cell breaks down during the mitosis process, the DNA has to be duplicated. After the envelope dissolves, the chromosomes separate, then the cell finally splits.
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.
Why do chromosomes line up in the middle of the cell during metaphase?
It is important that chromosomes move during mitosis because the chromosomes' sister chromatids need to separate. They must separate to become daughter cell-carrying chromosomes themselves.
