Mitosis1

Question 0

What is crossing-over?

Answer 0

•As the chromosomes line up beside each other,

they sometimes exchange portions of their chromatids - crossing over.

Question 1

What happens in Prophase1?

Answer 1

• Each chromosome lines up beside its corresponding homologous chromosome
• The nuclear membrane disappears

the centrioles move to opposite sides of the cell and

the nucleolus disappears.

Question 2

Crossing-Over produces what?

Answer 2

•Crossing over produces new combinations of genes

Question 3

What happens in Metaphase1?

Answer 3

•The tetrads, homologous pairs, line up in the center of the cell.

Question 4

What happens in Anaphase1?

Answer 4

•The homologous pairs are pulled to opposite sides of the cell by the spindle fibers.

Question 5

What happens in Telophase1?

Answer 5

• One set of homologous chromosomes end up on each pole.
• A new nuclear envelop forms and the nucleus splits.
• The cell splits, and each cell has the diploid number of chromosomes.