Meiosis/ Mitosis

College level Bio talking about the process of cell division

72 cards   |   Total Attempts: 182
  

Cards In This Set

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Prophase I
Chromatin become Chromosomes, Nuclear membrane fades, nucleus and nucleolus disappears, synapsis occurs, tetrads appear, sister chromosomes are present and crossing over takes place
Snyapsis
Each pair of homologous chromosomes move together in prophase I of meiosis
What is a tetrad made up of/ equal to?
2 dyads; 1 homologous pair of chromosomes; or 4 chromatids.
What happens in Metaphase 1 of Meiosis?
Homologous pairs of chromosomes line up at the equator
When does crossing over take place?
In Prophase 1 of Meiosis
What happens in Anaphase 1 of Meiosis?
Tetrads (dyads seperate, one goes south, the other dyad north) of each pair separate but the centromere stays connected.
What happens in Telophase 1 of meiosis?
Nuclear envelope reforms, nucleoli reappear and cells separate but there is no replication of DNA although the chromosomes are replicated.
What happens in prophase 2 of meiosis
Nuclear membrane fades, nucleus and nucleolus disappears, synapsis occurs, no tetrads just replicated chromosomes.
What happens in metaphase 2?
Replicated chromosomes in the two sister cells line up at the equator.
What happens in ananphase 2?
Chromatids separate from chromatids and the centomeres break apart and go to their respective poles.
What happens in telophase 2?
Four haploid daughter cells are created each containing on set (1n) of non replicated chromosomes.
What does mitosis do?
Only replicates somatic cells, what number of chromosomes you start with you end with. the cell starts diploid ends diploid.
Haploid
1 set or 1(n) refers to chromosomes. sex cells are haploid.
What chromosomes determines sex?
The 23rd. xx girl xy male,
What happens in the G1 interphase of the cell cycle?
It is a period of cell growth before the DNA is duplicated. proteins are being produced and the chromosomes are not replicated yet.