particularly in meiosis wherein 1 or some of the chromosomes have no homologous pair (e.g. in donkey and horses)...that is the parents do not have the same number of chromosomes.
2006-07-12 09:21:14 · 8 answers · asked by abstemious_entity 4 in Science & Mathematics ➔ Biology
A class protein complex call kinetochores allows microtubules of the spindle to attached to the chromosomes. The microtubules then pulled the chromosomes apart. Another complex call cohesin binds the sister chromosomes together. Then tension generated by the microtubules trying to pull the chromosomes apart and the cohesin trying to keep the chromosomes together help the cell ensure that all the chromosomes have the attached. When all the kinetochores are attached, the cell dissolves the cohesion which allows the chromosomes to pull apart.
I don't think in meiosis of an animal with non-homologous chromosomes (i.e. mules) that the chromosomes line up properly. Which I assume is one of the many reasons that animals like that are sterile.
2006-07-12 10:30:02 · answer #1 · answered by tsubame_z 2 · 0⤊ 0⤋
Oh my gosh! I should know this. But I don't think I do. I guess you could start by looking into kinetochore function, specifically mitosis-specific components (kinetochore region specifically during its mitotic maturation) For the second part, uneven pairs, I know that has to do with Down Syndrome and such, but am not sure how it is you are trying to relate the two. Are you asking maybe how the kinetochore functions in the absence of homologous pair to attach to? If you are, then I don't know. Sorry!
2006-07-12 10:11:50 · answer #2 · answered by godluvsmommas 2 · 0⤊ 0⤋
The spindle fibres are basically strands of microfibrils. During cell division protien synthesis in a cell rises. So the strands get attached to the centromere by protein where protein acts as a glue.
2006-07-12 10:06:54 · answer #3 · answered by daipayan_karmakar 1 · 0⤊ 0⤋
The actual mechanism is still being researched. As of yet, the actual triggering mechanism is unknown
2006-07-12 10:11:50 · answer #4 · answered by Mr. Lavos 1 · 0⤊ 0⤋
they physically pull the sister chromatids apart to the poles of the nucleus
2006-07-12 09:56:30 · answer #5 · answered by isurus 3 · 0⤊ 0⤋
There are a mess of proteins that take care of that
2006-07-12 09:24:58 · answer #6 · answered by bunja2 3 · 0⤊ 0⤋
You can rule out velcro. I know for a fact that's not it.
2006-07-12 09:24:57 · answer #7 · answered by cute_ark_girl 3 · 0⤊ 0⤋
a kinetochore.
2006-07-12 09:38:08 · answer #8 · answered by Megan 2 · 0⤊ 0⤋