B1: Chromosomes and Mitosis Flashcards
1
Q
what are chromosomes
A
coiled up lengths of DNA molecules.
2
Q
the cell cycle
A
a series of stages in the life cycle of a cell
3
Q
first stage- cell growth
A
the cell increases and grows the amount of subcellular structures
4
Q
second stage- DNA replication
A
duplicates its DNA to form 2 copies of each chromosome
5
Q
third stage- mitosis
A
- nuclear membrane breaks down
- chromosomes line up at the centre
- one set of chromosomes is pulled to each
end of the cell and the nucleus divides - forming two identical daughter cells