Meiosis_Long2

Set 1

Set 2

Set 3

Set 1

Set 2

Set 3

Choose

Draw a plant cell with a diploid number of six chromosomes to show:

Question 1

Question 2

Tabulate FIVE differences between mitosis and meiosis. (10)

Study the diagrams below showing two stages of meiosis.

Question 3

Name the phase of meiosis represented by diagrams I and II. (2)

Diagram I: metaphase I

Diagram II: metaphase II

State ONE visible reason in Diagram I which indicates that the process meiosis is taking place. (2)

Chromosomes are sharing genetic material - crossing over has taken place / pairs of chromosomes at the equator cell.

How many chromosomes would be present in each daughter cell at the end of meiosis? (2)

The chromosomes labelled A are not identical. Describe the process that leads to them being different. (5)

Homologous chromosomes come together in pairs. Each homologue consists of two chromatids held together by a centromere. An exchange of genetic material occurs between “facing”chromatids of homologous pair. This process is called the crossing-over, as the two chromatids of each homologue exchange genetic material.

Name the phase of meiosis that occurs after the phase represented by: a) Diagram I and b) Diagram II (4)

Diagram I: Anaphase I

Diagram II: Anaphase II

State ONE difference between the events that occur in the two phases mentioned above. (2)

During Anaphase I (Diagram I), whole chromosomes move towards opposite sides of the cell.

During Anaphase II, centromeres split and chromatids move towards opposite poles of the cell.

The diagrams below represent two different phases in meiosis of two different cells.

Question 4

Name the parts labelled: a) A and b) B (2)

a) Spindle fibres

b) Centromere

Identify the phase represented in a) Diagram 1 and b) Diagram 2 (2)

a) Metaphase 2

b) Anaphase 1

Name the process during meiosis which is responsible for the appearance of the chromosomes illustrated in Diagram 1. (1)

Crossing over

How many chromosomes would be found in each of the resulting cells at the end of the division of the cell shown in Diagram 1? (1)

State TWO reasons why you would regard meiosis as an important process. (4)

Exchange of genetic material introduces genetic variation.

Reduction of chromosome number to haploid number to keep the chromosome number constant from generation to generation.

Forms four haploid cells which function as gametes.

Independent assortment to cause genetic variation. (Any 2 reasons)

First prophase of meiosis. (5)

First anaphase of meiosis. (5)

Second prophase of meiosis. (5)

Questions source: DBE (Authorisation 11798)

- Greg Gopaul -