In metaphase 1 of meiosis, the homologous chromosomes line up side by.pdf

In metaphase 1 of meiosis, the homologous chromosomes line up side by side along the equator
so that (a) crossing-over (exchange of DNA regions) can occur between the homologous pairs
and (b) the homologous chromosomes can be pulled to opposite poles during anaphase 1. In
mitosis, by contrast, homologous chromosomes line up single-file along the equator. What
benefits are derived from these two different ways that homologous chromosomes are positioned
at metaphase in meiosis and mitosis?
Solution
The equatorial arrangement of chromosomes make the cell divisions to occur more
symmetrically. This chromosomal alignment is the keyspot of metazoan cell divisions. The
spindle fibers in both mitosis and meiosis relocate the metaphase plates if they are not properly
arranged. Homologous chromosomes functions differently in both mitosis and meiosis. The
homologous chromosomes in mitosis do not pair with eachother like they do in meiosis. They
line up independently at the equatorial plate whereas in meiosis they occur in pairs. The chances
of chromosomes to cross one another by mitotic recombination is very rare..

1. In metaphase 1 of meiosis, the homologous chromosomes line up side by side along the equator
so that (a) crossing-over (exchange of DNA regions) can occur between the homologous pairs
and (b) the homologous chromosomes can be pulled to opposite poles during anaphase 1. In
mitosis, by contrast, homologous chromosomes line up single-file along the equator. What
benefits are derived from these two different ways that homologous chromosomes are positioned
at metaphase in meiosis and mitosis?

Solution

The equatorial arrangement of chromosomes make the cell divisions to occur more
symmetrically. This chromosomal alignment is the keyspot of metazoan cell divisions. The
spindle fibers in both mitosis and meiosis relocate the metaphase plates if they are not properly
arranged. Homologous chromosomes functions differently in both mitosis and meiosis. The
homologous chromosomes in mitosis do not pair with eachother like they do in meiosis. They
line up independently at the equatorial plate whereas in meiosis they occur in pairs. The chances
of chromosomes to cross one another by mitotic recombination is very rare.