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A nuclear envelope forms around each set of chromosomes and cytokinesis occurs, producing four daughter cells, each with a haploid set of chromosomes.
The two chromosomes in each bivalent separate and migrate toward opposite poles.
The maternal and paternal chromosomes of each homologous pair separate and reach the poles of the cell, nuclear envelopes form around them, and cytokinesis follows to produce two cells.
List the events that occur in prophase I.
- The duplicated homologous chromosomes pair.
- Crossing-over between the homologous chromosomes occurs.
- The nucleolus disappears
- The meiotic spindle forms
- At the end of prophase I, the nuclear envelope disappears and the spindle enters the nucleus.
What is the stage of meiosis during which the pairs of chromosomes (the bivalents) become arranged on a plane equidistant from the poles?
What is the key difference between anaphase I in meiosis and anaphase in mitosis?
A key difference between mitosis and meiosis is that sister chromatids remain joined during anaphase I in meiosis, whereas in anaphase of mitosis they separate.
In what stage of meiosis do the centromeres separate, and the two chromatids of each chromosome move to opposite poles on the spindle?
What are the mechanisms by which genetic variation is produced by meiosis?
(1) Through the way the paternal and maternal chromosomes segregate; and (2) by the process of crossing-over.
If a diploid cell entering meiosis has 6 chromosome pairs, what is the number of possible chromosome combinations in the haploid nuclei?
The general formula for the number of possible chromosome combinations is 2n, where n is the number of chromosome pairs. For 6 chromosome pairs, the number of possible chromosome combinations is 26 = 64.