mitosis

Question 1

humans characteristic number of chromosomes

Answer 1

46. 23 pairs.

Question 2

cell cycle

Answer 2

Mitotic phase - division

Interphase 90% -
3 subphases: G1 S G2

Question 3

5 Mitosis stages

Answer 3

prophase 
prometaphase 
metaphase 
anaphase 
telophase

Question 4

Interhase (s and g2)

Answer 4

S - chromosomes duplicated

G2 - centrosomes duplicated

Question 5

Stage 1 - prophase

Answer 5

chromosomes condense

duplicated chromosome = sister chromatids

spindle forms

centrosomes - move apart (pushed by microtubules)

Question 6

stage 2 - prometaphase

Answer 6

nuclear envelope fragments

microtubules stick to kinetochores (centromere) = chromosomes move

other microtubules push each other away

Question 7

Stage 3 - metaphase

Answer 7

(line up)

chromosomes move to imaginary metaphase plate (tug of war)

centromere of sister chromatids straddle metaphase plate

Question 8

Stage 4 - anaphase

Answer 8

chromatids separate (now separate chromosomes)

new chromosomes migrate to poles

cell becomes egg shaped

Question 9

stage 5 - telophase

Answer 9

identical set of chromosomes at either pole

chromosomes uncoil

2 nuclear envelopes form

cytokinesis - microfilaments act like drawstrings on a bag

Question 10

animation

Answer 10

http://www.life10e.com/at11.01.html