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Meiosis Schumacher

QuestionAnswer
The double-layered membrane surrounding the nucleus of a eukaryotic cell, separating the nucleoplasm from the cytoplasm. nuclear membrane
A star-shaped cluster of microtubules radiating from the pericentriolar region, and seen immediately before and during mitosis of an animal cell. aster
a thin flexible barrier that surrounds all cells cell membrane
Each DNA strand in the duplicated chromosome chromatid
substance found in eukaryotic chromosomes that consists of DNA tightly coiled around histones chromatin
the point at which the chromatids attach along their length centromere
Spindle fibers extend from a region called the centrosome where these tiny paired structures are located centriole
Any of a network of filaments that collectively form a mitotic spindle (in mitosis) and meiotic spindle (in meiosis). It is chiefly involved in moving and segregating the chromosomes during nuclear division. spindle fibers
in eukaryotic cells, all cellular contents outside the nucleus; in prokaryotic cells, all of the cells' contents cytoplasm
A groove formed from the cell membrane in a dividing cell as the contractile ring tightens. cleavage furrow
sex cell gametes
The first stage in the first meiotic division of meiosis.Thus, this stage is important to increase genetic variation. This stage then ends with the disintegration of the nucleolus and the nuclear membrane. prophase I
The first stage in the second meiotic division of meiosis.In each of the two cells,the chromosomes migrate towards the cells centre. The stage ends when the chromosomes are aligned along a single plane in the centre of each cell. prophase II
The stage in the first meiotic division of meiosis. Homologous chromosomes pair with each other to form tetrads of four chromatids and they align themselves.This stage ends as soon as the homologous chromosomes start being pulled. metaphase I
The stage in the second meiotic division of meiosis, during which the chromosomes are aligned in each cell produced during the first meiotic division. Each chromosome can be observed as a pair of joined, identical chromatids. metaphase II
when the two chromosomes of each bivalent (tetrad) separate and start moving toward opposite poles of the cell as a result of the action of the spindle. anaphase I
The centromeres separate, and the two chromatids of each chromosome move to opposite poles on the spindle. The separated chromatids are now called chromosomes in their own right. anaphase II
The homologous chromosome pairs complete their migration to the two poles as a result of the action of the spindle. Now a haploid set of chromosomes is at each pole, with each chromosome still having two chromatids. telophase I
A nuclear envelope forms around each set of chromosomes. Cytokinesis takes place, producing four daughter cells, each with a haploid set of chromosomes. original parental chromosomes. telophase II
threadlike structure of DNA and protein that contains genetic information; in eukaryotes, chromosomes are found in the nucleus; in prokaryotes, they are found in the cytoplasm chromosome
Created by: jedinumber1
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