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GENES, DNA AND CHROMOSOMES
· IN A NUCLEUS, THERE ARE TWO SETS OF
CHROMOSOMES. EACH CHROMOSOME IS MADE
FORM DNA (DEOXYRIBOSE NUCLEIC ACID).
· GENESE ARE SHORT SECTIONS OF DNA.
· A NORMAL BODY CELL CONTAINS 46
CHROMOSOMES WHEREAS A GAMETE (SEX CELL)
CONTAINS 23.
· WHEN A MALE GAMETE AND A FEMALE GAMETE
FUSE TOGETHER, IT PRODUCES A NEW CELL WITH
A WHOLE SET OF CHROMOSOMES.…read more

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MITOSIS
· MITOSIS IS A TYPE OF CELL DIVISION THAT IS
USED FOR GROWTH AND REPAIR.
· WHEN A CELL DIVIDES BY MITOSIS, TWO CELLS
ARE FORMED AND EACH CELL IS IDENTICAL TO
THE ONE THAT IT WAS FORMED FROM.…read more

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DIAGRAM
1. parent cell
2. chromosomes make identical copies
of themselves
3. they line up along the centre
4. they move apart
5. two daughter cells form with identical
chromosomes to the parent cell…read more

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MEIOSIS
· MEIOSIS IS THE OTHER TYPE OF CELL DIVISION
WHICH IS USED TO PRODUCT GAMETES.
· THE DIVISION LEADS TO FOUR CELLS BEING
FORMED AND EACH ONE HAS 23
CHROMOSOMES ONLY.
· THIS IS NECESSARY AS WHEN TWO GAMETES
FUSE, THEN THE NEW CELL CREATED CAN
HAVE A FULL SET OF CHROMOSOMES.…read more

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