B2 Mitosis

Question 1

Why is mitosis important?

Answer 1

repair damaged,old,lost cells

growth

Question 2

Name 5 parts of cell cycle

and what happens?

Answer 2

Interphase-duplicates DNA .One copy for each new cell.X shaped chromosomes
Prophase-chromo.. condense,getting shorter and fatter
lie free in cytoplasm

Metaphase-chromo….line up in centre

Anaphase-cell fibres pull chromo… apart.2 arms of each chromo.. go to opposite ends of cell

Telophase-membranes form around each set of
chromo..2 nucleus in one cell

Cytokinesis-2 separate cells formed

Question 3

Name 3 things growth involves

Answer 3

cell division-mitosis
differentiation-cells become specialised to do job
elongation-plant cell expands making cell bigger making plant grow.

Question 4

What causes cancer?

Answer 4

uncontrolled cell division
change in gene that controls cell division = cell dividing uncontrollably
mass of abnormal cell called tumor: destroys surrounding tissue

Question 5

Explain what 4th percentile means?

Answer 5

4 % of ppl are = to or lighter than it

and 96 % are heavier