15 terms

Meiosis

Meiosis has two divisions of the nucleus- meiosis I and meiosis II. 4 cells are created as a result.
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Prophase 1
Chromosomes condense
Each chromosome pairs with its corresponding homologous chromosome to form a tetrad
Crossing over occurs to exchange genetic information betwen homologous chromosomes
Metaphase 1
Homologous chromosomes attach to spindle fibers from opposite poles
Anaphase 1
Homologous chromosomes (not sister chromatids like in mitosis) separate from each other.
Each homologous chromosome still has two sister chromatids
Each chromatid has a part of the information from the other sister chromatid that it received through crossing over
The centromere does not spit.
Telophase 1
The cytoplasm divides and two new cells form.
Each new cell has one duplicated chromosome from each similar pair.
Prophase 2
The duplicated chromosomes and spindle fibers reappear in each new cell.
Metaphase 2
Chromosomes line up individually across the center of the cell as in mitosis
Each chromosome connects to spindle microtubules at centromere
Anaphase 2
Sister chromatids separate and move to opposite ends of the cell.
Each chromatid is now an individual chromosome.
Telophase 2
The spindle fibres disappear and a nuclear membrane forms around each set of chromosomes.
Homologous chromosomes
Chromosomes that have the same sequence of genes, that have the same structure, and that pair during meiosis.
Interphase
Chromosomes (uncondensed in this phase) replicate in preparation for meiosis
Replication occurs when during meiosis
Chromosomes duplicate before starting the process of meiosis I
NOT meiosis II
Meiosis occurs in what type of organisms and where
those that sexually reproduce
How many divisions are there in Meiosis versus mitosis
2 versus 1
How many daughter cells are produced in meiosis
4
How many chromosomes are there in each daughter cell after meiosis is complete compared to the original cell
half
haploid
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