mitosis

Question 1

Prophase

Answer 1

chromosomes condense and neuclear envolope breaks down spindle forms

Question 2

metaphase

Answer 2

chromosomes line up at the equator of spindle fibres form

Question 3

what order is mitosis

Answer 3

prophase metaphase anaphase telophase

Question 4

anaphase

Answer 4

sister chromatids are pulled to opposite sides of the cell

Question 5

Telophase

Answer 5

neuclear envolopes form chromosomes decondense

Question 6

Describe the main events of the cell cycle, excluding mitosis.

Answer 6

g1 cell grows and makes proteins and organelles
s phase DNA is replicated
g2 cell continues to grow and prepair for mitosis

Question 7

Explain why checkpoints are important in the cell cycle.

Answer 7

prevents cells with errors in DNA from dividing helping cells that are genetically identical forming

Question 7

A student states that most cells in a growing tissue are in mitosis. Is this correct?

Answer 7

no most cells are in interphase

Question 8

How does mitosis ensure genetic consistency?

Answer 8

produces daughter cells with the same amount of chromosomes. DNA is checked for errors throughout replication

Question 9

Explain how meiosis results in genetic variation.

Answer 9

crossing over takes place in prophase I so chromatids exchange genetic information

independant assortment in metaphase I also causes random seperation of perental chromosomes

leading to geneticly diverse gametes

random fertalisation also causes genetic variation

Question 10

State the number of chromosomes in human gametes and explain how meiosis ensures this.

Answer 10

23 in meiosis there are 4 cell divisions

Question 10

Describe one difference between the daughter cells formed in mitosis and those formed in meiosis.

Answer 10

cells formed by meiosis are genetically different while cells formed by mitosis are geneticly similar