Mitosis

Question 1

How does the shortening o spindle fibres affect mitosis

Answer 1

Less homologous chromosmes lining up so less hromosmes in daughther cells
cell can stop going to next stage and developing chromatids cannot be separated
Mitosis would stop at metaphase, so anaphase cannot occur and chromosomes remain at equator

Question 2

Describe Interphase of mitosis

Answer 2

G1) New daughter cells are produced and enter a period of growth. Chromosomes aren’t clear during interphase

S) Syntheisis occurs as chromomsems duplicate and doubles, forming 92 chromosomes. Centrolies appear.

G2) Cenrtolie pairs move apart and ATP energy is acculated before mitosis begins.

Question 3

Describe prophase ( Two stages)

Answer 3

Chromatids shorten, coil and thicken. Nuclear envelope breaks up and asters begin to form

Chromatids joined by centromere and crossing over occurs. Centrioile pairs move too opposite sides and microtubules form a spindle

Question 4

Describe Metaphase

Answer 4

Cenrtomeres on chromosomes attach to microtubules of spindle. Chromosomes are pulled apart.

Question 5

Anaphase

Answer 5

Chromosome pairs sepeatre and move to opposite poles of the cell

Question 6

Telophase

Answer 6

Chromosomes arrive at poles and begin to uncoil whereby asters and spindles disslve and nuclear envelope forms.

Question 7

Whats the reason for mitosis

Answer 7

Ensures organisms have gentic consistency,

growth and repair

Question 8

Whats the difference between meiosis and mitosis

Answer 8

Mitosis produces dipoid with 46 chromosomes 2 daughter cells
Meiosis is haploid , producing 23 chrmomsomes 4 daughter cells

Mitosis has chrmomsomes which replicate once and nucleus divides once
Meiosis has just a single replication of chromosomes

Daughter cells that are the product of mitosis are genetically identical. Daughter cells produced after meiosis are genetically diverse.

Mitosis involves the division of body cells, while meiosis involves the division of sex cells