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meiosis - Coggle Diagram
meiosis
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in depth meiosis 1
Metaphase 1- chromosomes assemble on metaphase plate instead of the individual chromosomes, the orientation is random and independent and can face either pole (independent assortment) and can result in many different alleles
Prophase 1- chromosomes condense, nuclear envelope disintegrates and spindle formation begins. the difference is homologous chromosomes pair up forming bivalents
Anaphase 1- Different to mitosis as homologous chromosomes are pulled to opposite poles and chromatids stay joined. Some of the DNA sections on chromatids break and rejoin which cause dna exchange between chromatids (chiastima)
Telophase 1- essentially the same as in mitosis, chromosomes assemble at each pole and nuclear membrane reforms and then undergoes cytokinesis to divide into two cells
in depth meiosis 2
Metaphase 2- different to metaphase 1 as individual chromosomes form on the metaphase plate like in mitosis, due to crossing over there is more independent assortment
Anaphase 2- same as anaphase of mitosis, the 2 individual chromatids of the chromosomes get pulled to opposite poles
Prophase 2- chromatids condense, nuclear envelope breaks down and spindles begin to form
Telophase 2- same poles as telophase in mitosis the chromosomes unravel into chromatin, nuclear envelope reforms, and cytokinesis results in 4 new cells
stages of meiosis
meiosis 1
first division where the pairs of homologous chromosomes are separated into two cells, each cell will have only one full set of genes instead of two so they are haploid
meiosis 2
second division is similar to mitosis, the pairs of chromatids separate and form two more cells ( 4 haploid cells in total)