Mitosis and Meiosis

Question 1

List the steps of Mitosis

Answer 1

Prophase, metaphase, anaphase, telophase

Question 2

Prophase:

Answer 2

DNA condenses. Centrioles migrate to opposite poles and

microtubules form. Nuclear envelope disappears.

Question 3

Metaphase

Answer 3

“Meet in the middle”. Chromosomes meet in middle.

Question 4

Anaphase:

Answer 4

“Apart”. Sister chromatids separate and move to opposite poles

Question 5

Telophase:

Answer 5

Chromosomes decondense. Nuclear membrane forms. Cytokinesis

occurs

Question 6

True/False: Ploidy of 2n throughout mitosis.

Answer 6

True

Question 7

When does nondisjunction occur?

Answer 7

Nondisjunction: When sister chromatids don’t separate

properly during anaphase. Results in aneuploidy

Question 8

Prophase I:

Answer 8

Chromosomes condense, nuclear membrane dissolves, homologous
chromosomes form bivalents, crossing over occurs.

Question 9

What stage of meiosis does crossing over occurs

Answer 9

prophase 1

Question 10

Metaphase I:

Answer 10

Spindle fibers from opposing centrosomes connect to bivalents (at
centromeres) and align them along the middle of the cell.

Question 11

Anaphase I:

Answer 11

Homologous pairs move to opposite poles of the cell. This is
disjunction and it accounts for the Law of Segregation.

Question 12

Telophase I:

Answer 12

Chromosomes decondense, nuclear membrane MAY reform, cell

divides (cytokinesis), forms two haploid daughter cells of unequal sizes.

Question 13

Prophase II:

Answer 13

: Chromosomes condense, nuclear membrane dissolves, centrosomes
move to opposite poles (perpendicular to before).

Question 14

Metaphase II:

Answer 14

Spindle fibers from opposing centrosomes attach to chromosomes (at
centromere) and align them along the cell equator

Question 15

Anaphase II:

Answer 15

Spindle fibers contract and separate the sister chromatids, chromatids
(now called chromosomes) move to opposite poles.

Question 16

Telophase II:

Answer 16

Chromosomes decondense, nuclear membrane reforms, cells divide
(cytokinesis) to form four haploid daughter cells