Meiosis

Question 1

Crossing over

Answer 1

Exchange of genetic material (DNA) between homologous pairs.

Question 2

Bivalent

Answer 2

Pair of homologous chromosomes held together by crossing over of DNA.

Question 3

Independent segregation

Answer 3

Maternal and paternal chromosomes line up in random orders of the equator of the cell.

Question 4

What meiosis involves

Answer 4

1 - homologous pairs of chromosomes line up along the equator.
2 - homologous pairs of chromosomes form bivalents and crossing over of genetic material occurs.

Question 5

Meiosis

Answer 5

• Makes 4 cells
• Makes gametes
• 2n -> n
• Makes pollen
• Crossing over occurs
• Chromosome number halved

Question 6

Meiosis and Mitosis

Similar factors

Answer 6

• Includes P, M, A, T

- Cell reproduction

Question 7

Mitosis

Answer 7

• Makes 2 cells
• Makes somatic cells
• Makes rbc
• Asexual reproduction
• Creates a clone
• Same chromosome number

Question 8

Homologous pair of chromosomes

Answer 8

Pair of chromosomes matched in size and shape.

Question 9

Meiosis Stage 1 and 2 Cell Division

Answer 9

Meiosis 1:
- Homologous chromosomes pair up.
- Chromatids cross over
- One chromosome from each homologous pair end up in each cell.
Meiosis 2:
- Each cell has a different chromatid therefore a different set of alleles which increases genetic variation in potential offspring.

Question 10

Meiosis stages

Answer 10

1 Chromatids separate
2 Homologous chromosomes pair up and form a bivalent
3 Crossing over occurs
4 Homologs line up along equator, not in homologous pairs
5 Cytoplasm divides (cytokinesis) 2 daughter cells are formed
6 Chromosomes line up along equator, not in homologous pairs
7 Nuclear membrane reforms, cytokinesis, 4 daughter cells formed