Lecture 13 - Mitosis

Question 1

How are karyotypes made?

Answer 1

• Take blood sample
• Treat cells with mitogen
• Then colchicine

Question 1

Which domain of life do protists belong to?

Answer 1

Eurkarya

Question 2

What do multicellular organisms depend on cell division for?

Answer 2

• development from a fertilized cell.
• growth to adult (10^14 cells).
• repair.

Question 3

The longest part of the cell cycle is:

(A) the G1 phase.
(B) interphase.
(C) mitosis.
(D) prophase.

Answer 3

(B) interphase.

Question 4

Each sister chromatid in mitosis contains:

(A) 2 single-stranded copies of their DNA molecule.
(B) 2 double-stranded copies of their DNA molecule.
(C) 1 single-stranded copy of their DNA molecule.
(D) 1 double-stranded copy of their DNA molecule.

Answer 4

(D) 1 double-stranded copy of their DNA molecule.

Question 5

What is a duplicated chromosome?

Answer 5

Two sister chromatids

Question 6

What are the phases of Mitosis? (5)

Answer 6

• Prophase
• Prometaphase
• Metaphase
• Anaphase
• Telophase

Question 7

When do sister chromatids separate?

Answer 7

Anaphase

Question 8

What are the phases of interphase?

Answer 8

G1 phase, S phase and G2 phase

Question 9

What happens during Prophase of Mitosis?

Answer 9

Chromosomes condense in the nucleus, centrosomes separate and form early miotic spindle (microtubules) between them

Question 10

What happens during Prometaphase of Mitosis?

Answer 10

Asters are now opposing each other in cell (north and south pole), chromosomes attach to microtubules on mitotic spindle (kinetochore microtubules) via kinetochore

Question 11

What happens during Metaphase of Mitosis?

Answer 11

Centromeres of chromosomes line up on metaphase plate

Question 12

What happens during Anaphase of Mitosis?

Answer 12

Non kinetochore microtubules lengthen. Kinetochore microtubules shorten ripping the chromosomes apart at the centromere forming daughter singular chromosomes. The daughter chromosomes move to opposite ends of the cell

Question 13

What happens during Telophase of Mitosis?

Answer 13

Cleavage furrow form in between

Question 14

During mitotic anaphase:

A. the daughter chromosomes move to opposite ends of the cell.
B. the non-kinetochore microtubules shorten.
C. the kinetochore microtubules lengthen.
D. all of the above.

Answer 14

A. the daughter chromosomes move to opposite ends of the cell.

The non-kinetochore microtubules LENGTHEN while the kinetochore microtubules SHORTEN