When the homologous pairs line up, is it four separate chromatids that are lining up, and two go to each new cell? When you say that the homologous chromosomes separate, do they mean chromosome as in two chromatids or one?
2006-09-26 15:09:48 · 3 answers · asked by Kiko 3 in Science & Mathematics ➔ Biology
Yes, chromosome replication occurs before prophase 1 ("Interphase"). Each chromosome is now composed of two chromatids held together by a centromere. When homologous pairs line-up (Meiotic metaphase 1) there are four chromatids across.
This pairing up is called synapsis, and you have 4 chromatids across. (sometimes the chromatids get tangled up here!)
In the next phase (anaphase 1) , each chromosome , which is composed of two chromatids ,separate. In other words, the "double" chromosomes separate.
2006-09-26 16:02:22 · answer #1 · answered by ursaitaliano70 7 · 0⤊ 0⤋
dna replicates during the S phase of meiosis I. during meiosis I, homologous chromosomes, not chromatids line up. so chromosomes are the ones that separate. however, during meisosis 2, it is the chromatids that separate and go to the daughter cells.
2006-09-26 15:14:28 · answer #2 · answered by hott lips 3 · 0⤊ 0⤋
Meiosis an mitosis are sorts of cellular branch. There are stages said as prophase, metaphase, anaphase, and telephase. contained in the diverse stages, the chromosomes and the cellular divide to create 2 new cells from scratch. mitosis creates 2 right replicas, while meiosis is mostly a branch of sex cells so the replicas are not to any extent further an identical. There are 4 new cells as a effect of meiosis compared to mitosis, the position you only get 2 cells. Meiosis is going through the steps of cellular branch two times :)
2016-11-24 21:27:43 · answer #3 · answered by ? 4 · 0⤊ 0⤋