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U18
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1
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There are 46 chromosomes present in the
cell
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The second stage in mitosis is the prophase, as chromosomes are doubled to 92 it
also means the spindle fibres are formed as it’s needed to separate the
chromosomes equally
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Third stage in mitosis is the prometaphase, the nuclear membrane is present during
this stage and is also present in the prophase
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4
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During this stage, all
chromosomes within the cell align in the middle of the cell
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Anaphase is the fifth stage in mitosis
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6
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Groups of chromosomes become a nucleus
once a nuclear membrane has reformed
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The last stage of mitosis is the cytokinesis
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U18
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1
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The DNA curl into chromosomes, the nuclear
envelope and nucleolus disappear, leading to mitotic spindle to form, and synapsis to occur
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The second stage in meiosis is the metaphase I, to each of the homologous chromosome
the spindle fibres attach to the centromere
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Third stage in meiosis is the anaphase I, the homologous chromosomes shifts to the
opposite poles of the cell
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Fourth stage of meiosis is telophase I, in this stage the chromosomes reach the opposite
end of a cell, this then leads to cytokinesis commencing
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Prophase II is the fifth stage in meiosis
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6
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Chromosomes travel to the midline of the
dividing cell, facing the opposite poles of the dividing cell
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Anaphase II, This stage is where the chromatids detached and move to the opposite poles
of the cell
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Telophase II is the last stage in meiosis
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U18
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2

MITOSIS

U18
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The offspring gain half the number of
chromosomes but not half of the DNA information from both individuals, because of random
variation
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This then produce a
unique combination of genes, resulting in the zygote produced by the combination of each
individual’s gamete
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A diagram showing chiasmata, genes from homologous
chromosomes being swapped randomly
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DNA is a particle which chromosomes comprises of the request of DNA decides qualities
which then decides attributes of posterity
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At that point you got two of every quality
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This implies the qualities are swapped over making an almost no to about
strange capacity to deliver another chromosome that has the precise coding as ones already
coded
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Summary points of random variation:


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

Only 20% chance of sharing the same combination of genes
The same combination of traits but different genes
Identical chromosomes, different genes
Similar, but not identical combination of genes
Different chromosomes, same identical genes

U18
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k12
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us, (2015)
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Mitosis
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bristol
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ct
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cfm?p=7094 [Accessed 9 Oct
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Castell Alun High School - Biology, (2015)
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[online] Available at:
http://cahsbiology
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com/mitosis
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2015]
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, Echard, A
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(2006)
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Current Biology, 16(4), pp
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May, K
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(2006)
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Journal of Cell Science,
119(20), pp
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Nature
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metaphase | Learn Science at Scitable
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nature
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2015]
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net, (2010)
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slideshare
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2015]
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jccc
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Mitosis
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jccc
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html [Accessed 9 Oct
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Quizlet
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N
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, 2015
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9 Oct
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Dictionary
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N
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, 2015
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9 Oct
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Iws
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edu, 'Random Fertilization'
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p
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Web
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2015
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N
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, 2015
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9 Oct
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Biotech
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edu, 'Bio2107 (Houghton'15)'
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p
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Web
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2015
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bioninja
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au, '5
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N
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, 2015
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9 Oct
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