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ISB 204 Exam 2--Meiosis
N/A
20
Biology
Undergraduate 1
03/15/2012

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Term
somatic cell
Definition
cells that reproduce through mitosis
Term
gametes
Definition
all cells in organism except for the reproductive cells
-reproductive cells that have undergone meiosis and contain half the number of chromosomes as somatic cells
Term
meiosis
Definition
process in which single diploid divides to produce haploid reporductive cells, produces four cells
Term
2n
Definition
diploid, possessing two sets of chromosomes
Term
1n
Definition
haploid, posessing a single set of chromosomes
Term
meiosis 1
Definition
phrophase 1, metaphase 1, anaphase 1, telephase 1
Term
phrophase 1
Definition
homologous chromsomes pair up, crossing over, unwind from each other although remain overlapped
Term
metaphase 1
Definition
-still paired up, chromosomes moved to metaphase plate
Term
independent assortment
Definition
-random allignment of homologous chromosomes during metaphase 1 that contributes to the unique genome found in each gamete
Term
anapahse 1
Definition
-paired chromsomes now begin to move away from each other, toward respective poles, pulled through disasembly of microtubule spindles they are attached to
-each pair still made up of joined pair of sister chromatid
-separate homologus chromosomes
Term
telephase 1
Definition
-original cells now undergo cytokineses: dividing into two completely seperate daughter cells
-two haploid cells
Term
meiosis 11
Definition
-another division
-prophase 2
-metaphase 2
-anapshase 2
-telephase 2
Term
crossing over
Definition
-process occuring in meiosis where homolous chromosomes exchange reciprocal portions of themselves
-mixes genes that are on same chromosome
Term
sex chromosomes
Definition
chromosomes that determine sex of individual
Term
steps in meiosis
Definition
-end of interphase
-prophase 1
-metipahse 1
-anaphase 1
-telephase 1
-phrophase 2
-metaphase 2
-anaphase 2
-telephase 2
Term
metapase 2
Definition
sister chromatids lineup at new metaphase plate
Term
anapahse 2
Definition
sister chromatids seperate
Term
telephase 2
Definition
four haploid cells result
Term
segregation
Definition
anapahse 1
-separating homolgous chromosomes reduces the genetic information by 1/2
Term
cloning vs. sexual reproduction
Definition
-cloning doesn't use meiosis
-sexual reproduction based on mitosis and offspirng is an exact copy
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