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Slide 1

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Cell Division
WJEC AS Biology
BY1 Topic 1.7…read more

Slide 2

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· Made up of DNA, protein and a small amount of RNA
· DNA occurs as a single strand in the form of a double helix
· Each DNA section made up of genes
· Only on the onset of cell division become visible
· Shortly before cell division each DNA makes copy of itself
· Single thread becomes 2 identical threads
· These are called chromatids, joined by a centromere
· Matching pairs- Homologous
· Humans have 23 pairs of homologous chromosomes. The
total number of chromosomes = diploid number
· Human gamete has haploid (half the diploid number)…read more

Slide 3

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Grade Boosters
· Chromosomes are referred to as chromatids
after chromosomes have divided at interphase
until telophase when they reach the poles of
the cells and are refereed to as chromosomes
· Homologous ­ In the diploid cell each
chromosome has a partner of exactly the
same length with precisely the same genes…read more

Slide 4

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Cell Cycle
What happens at interphase?
- Cell increases in size Cell Division
- Productions of organelles
- Replication of DNA…read more

Slide 5

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Grade Boosters
· Interphase is a period of intense metabolic
activity ­ process needs energy in the form of
· Chromosomes are not visible at interphase
because the chromosome material,
chromatin, is dispersed throughout the
· Mitosis is a continuous process…read more

Slide 6

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FUNCTION: to increase number of cells
genetically identical to parent cell
OCCURS: During growth, asexual reproduction
Mitosis produces 2 daughter cells that are genetically
identical to the parent cell…read more

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A useful description of meiosis and mitosis with some helpful grade booster slides that show grade boosting facts and a summary comparison table at the end.

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