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3.3: Meiosis

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Define "meiosis."



Understanding: One of diploid nucleus divides by meiosis to produce four haploid nuclei.
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Terms in this set (38)
Define "meiosis."



Understanding: One of diploid nucleus divides by meiosis to produce four haploid nuclei.
Meiosis is a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes.
Compare divisions of meiosis I and meiosis II.​



Understanding: One of diploid nucleus divides by meiosis to produce four haploid nuclei.
Meiosis I
Reductive division (diploid to haploid)
Results in two haploid cells
Chromosomes remain replicated (X)
Crossing over occurs
Proceeded by interphase with DNA replication

Meiosis II
Non-reductive division (haploid to haploid)
Results in four haploid cells
Chromatids of a chromosome separate (X to / and \)
No crossing over occurs
Proceeded by interkinesis, without DNA replication
Compare sexual and asexual life cycles.



Understanding: The halving of the chromosomes number allows a sexual life cycle with fusion of gametes.
The life cycle is the period of time that an organism passes through until producing offspring of its own.

Sexual
Two parents
Meisosis
results in increased genetic variation

Asexual
One parent
Fission, mitosis or budding
Requires less energy
Explain why meiosis must occur as part of a sexual life cycle.​



Understanding: The halving of the chromosomes number allows a sexual life cycle with fusion of gametes.
The sexual life cycle combines genetic information from two parents. In order to maintain the correct number of chromosomes in the offspring, the parents must undergo meiosis to create gametes with half of the genetic information.
State that DNA is replicated in interphase before meiosis.



Understanding: DNA is replicated before meiosis so that all chromosomes consist of two sister chromatids.
During "S" phase of interphase, before meiosis, the DNA molecule(s) in the cell replicate, creating two identical copies of the DNA, held together at a centromere.