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Meiosis
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38 Terms
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1
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Gametes are
haploid
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Somatic cells are
diploid
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somatic cells
body cells
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Number of chromosomes in diploids
46
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Number of chromosomes in haploids
23
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Diploid cells contain
Two sets of homologous chromosomes
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Haploid cells contain
One set of chromosomes and half the genes from each parent cell
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Homologous chromosomes
set of cells which comes from male and female parent cells
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What type of cell division happens most of the time?
mitosis
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When does meiosis happen?
sexual reproduction
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Number of rounds (meiosis)
2
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Goal of meiosis
For 1 diploid cell to become 4 haploid cells
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Crossing over
Process in which homologous chromosomes exchange portions of their chromatids during meiosis.
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Alleles
Different forms of a gene
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How must the alleles be in crossing over?
aligned
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Result of crossing over
genetic diversity and 4 different chromosomes
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Oogenisis
Production of mature egg characterized by an unequal cytokinesis
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Phases of Meiosis 1
Interphase, Prophase 1, Metaphase 1, Anaphase 1, Telophase 1, Cytokinesis
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Phases of Meiosis 2
prophase 2, metaphase 2, anaphase 2, telophase 2, cytokinesis
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What happens in Prophase 1
Duplicated chromatin forms into sister chromatids. Tetrads form and crossing over occurs. Spindle fibers are created.
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What happens in Metaphase 1
Chromosome pairs line up in the center. Spindle fibers attach themselves to the chromosomes.
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What happens in Anaphase 1?
Spindle fibers pull homologous chromosomes to opposite sides of the cells
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What happens in Telophase 1 and Cytokinesis?
Nuclear membrane forms. Spindle disassembles. The cell splits into two cells with 46 chromosomes
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What happens in Prophase 2?
2 haploid daughter cells with 46 chromosomes each are introduced from Meiosis 1. New spindle fibers are created.
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What happens in Metaphase 2?
Chromosomes line up in the middle of the cell. Spindle fibers attach to centromeres.
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What happens in Anaphase 2?
Sister chromatids are pulled apart and move to opposite sides of the cell.
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What happens in Telophase 2 and Cytokinesis?
Spindle fibers disassemble. Two cells each split and 4 haploid cells are made with 23 chromosomes.
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Zygote
fertilized egg
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Tetrad
Homologous pair of chromosomes each made up of 2 chromatids. Required for crossing over
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Variable(s) for diploids
2n
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Variable(s) for haploids
n
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Polar bodies
The 3 additional haploid cells that will not be fertilized and were created during the creation of an oocyte
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Oogenesis
the production, growth, and maturation of an egg, or ovum
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Spermatogenesis
production of sperm
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synapsis
the process of pairing homologous chromosomes
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fertilization
when a sperm and egg combine
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homologous
matching chromosomes
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What happens in interphase
the cell’s chromosomes duplicate
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