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Cell Division
- Higher tier info
- When a cell
divides to form
gametes:
- -copies of the genetic
information are made
- -then the cell divides
twice to form
gametes, each with a
single set of
chromosomes
- -then the cell divides
twice to form
gametes, each with a
single set of
chromosomes
- -copies of the genetic
information are made
- When a cell
divides to form
gametes:
- Body cells divide by mitosis
- When a cell divides by mitosis
- -copies of the genetic material are made
- -then the cell divides
once to form two
genetically identical
body cells
- -then the cell divides
once to form two
genetically identical
body cells
- Mitosis occurs during
growth or to produce
replacement cells
- Cells of the offspring produced by asexual
reproduction are produced by mitosis from the
parental cells (contain same alleles as parents)
- -copies of the genetic material are made
- Gametes
- Cells in reproductive
organs (testes and
ovaries in humans)
divide to form gametes
- The type of cell division
in which a cell divides to
from gametes is called
meiosis
- At fertilisation, a single body cell w/ new pairs
of chromosomes is formed. A new individual
then develops by this cell repeatedly dividing
by mitosis
- Cells in reproductive
organs (testes and
ovaries in humans)
divide to form gametes
- Most types of animal cells differentiate at an early stage
whereas many plant cells retain the ability to differentiate
throughout life. In mature animals, cell division is mainly
restricted to repair and replacement.
- Stem Cells
- Cells from human embryos and
adult bone marrow can be:
- - called stem cells
- - made to differentiate into
many diff types of cells, eg
nerve cells
- - called stem cells
- Treatment w/ stem
cells may be able to
help conditions such as
paralysis
- Human
stem cells
can develop
into any
kind of
human cell
- Cells from human embryos and
adult bone marrow can be:
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