Biology GCSE (1)

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gene - DNA - chromosomes in nucleus

girl - **

boy - XY

mitosis - allows growth, repair and heal - 2 new daughter cells (identical)

cell has to make exact copy of chromosomes -> 2 seperate cells 

meiosis - gametes, egg and sperm, 23 chromosomes each, haploid cells

only happens in reproductive 

exact copy of dna, 1 of each pair gets seperated to each cell, then meiosis

a random selection from each chromosomes


biological catalysts

denatured - not killed - temperature and pH

temperature - increases, speeds up reactions but…




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