Meiosis

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meiosis

process in which haploid gametes are formed

how many rounds of cell division in meiosis

2

interphase

chromosomes replicate, forming two sister chromatids joined with centromere

prophase I

• chromosomes condense

• nuclear membrane dissolves

• spindle fibers form

• synapsis occurs

• crossing over occurs

synapsis

chromosomes pair in homologous pairs called “tetrads”

crossing over

exchange of genetic material between homologous chromosomes

metaphase I

• homologous pairs line up at equator

• spindle fibers attach to chromosomes at centromere

anaphase I

• spindle fibers pull homologous chromosomes to opp poles

• reduction division occurs

reduction division

only one chromosome from each homologous pair in each daughter cell

telophase I

• nuclear membrane reforms

• two daughter cells formed

T or F: the daughter cells are genetically identical

F

prophase II

• no DNA replication between meiosis I and II

• one set of chromosomes with two sister chromatids

  • not identical bc of crossing over

• nuclear membrane dissolves

• spindle fibers form

metaphase II

• chromosomes line up at equator

• spindle fibers attach to chromatids

anaphase II

sister chromatids separate and move to opp poles

telophase II

• nuclei form

• four genetically distinct daughter cells

cytokinesis

• daughter cells split apart

• furrow forms in membrane, cell pinched in two

how are the daughter cells genetically distinct

recombination and crossing over