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Meiosis Questions

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Yoo Jin Lee

on 25 February 2011

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Transcript of Meiosis Questions

Meiosis Questions
Yoo Jin Lee
Erin Dempsey What are homologous Chromosomes? Chromosomes with the same gene sequences that are paired during meiosis. Human Chromosome Number

Diploid (2n): 46 chromatids or 23 chromosomes
Haploid (n) : 23 chromatids Crossing Over

Crossing over is a process occurring in prophase I where the homologous chromosomes tangle and exchange genetic information. This occurs in nature to prevent genes from being lost due to natural selection and to ensure that the daughter cells produced are not identical. Bibliography

http://www.buzzle.com/articles/difference-between-mitosis-and-meiosis.html Meiosis I Meiosis II Interphase
- DNA replicates to prepare for meiosis I
- the genetic materials are in a form called chromatid, without any distinct shape
Prophase I
- centrosomes form spindle as they move to opposite poles
- homologous chromosomes pair up (synapsis) and exchange genetic
materials (crossing over)
Metaphase I
- homologous chromosomes line up at the equatorial plate, one homologon of
the pair on the either of the plate
- homologons align on random sides; maternal and paternal chromosomes do
not necessarily line up on the same side
Anaphase I
-the chromosomes seperate to the opposite poles of the cell
-the sister chromatids of each chromosome are not identical to each other because of crossing over
Telophase I
-chromosomes decondense and nuclear envelope reforms
-cytoplasm divides into two daughter cells
- the daughter cells prepare for meiosis II
- the DNA does not replicate Reduction Division

Unique cell division used to produce
sex cells in organisms. The nucleus
divides into four new nuclei, each
possessing half the original number
of chromosomes.

Prophase II
- chromatin condenses into discrete chromosomes
- centrioles split and move to opposite poles
Metaphase II
- chromosomes line up at the equatorial plate
- spindles from opposite poles attach to each sister chromatids
Anaphase II
- the centromeres divide into two
- sister chromatids of a chromosome move to opposite poles of the cell
Telophase II
- chromatids decondenses into chromatids and nuclear membrane reforms
- the cytoplasm of each daughter cell divide into two, resulting in a total of
four daughter cells Mitosis vs. Meiosis

Consits of a single division, and results in two daughter cells

The daughter cells have identical genetic information as each other and their mother cell

Occurs in somatic cells (non-sex cells)

Products have diploid amount of chromosomes each Consists of two divisions, and results in four daughter cells

The daughter cells have unidentical genetic information as each other and their mother cell

Occurs in gametes (sex cells)

Products have haploid amount of chromosomes each Meiosis I Meiosis II



http://ghr.nlm.nih.gov/handbook/illustrations/mitosismeiosis http://www.youtube.com/watch?v=uh7c8YbYGqo&feature=related
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