Lab 10: Cell Division

Question 1

Why do cells divide?

Answer 1

To allow an organism to:

Grow, mature, and maintain tissues

Question 2

What phase does DNA dense up into chromosomes?

Answer 2

Prophase

Question 3

What happens during telophase?

Answer 3

Nuclear membrane develops around the separated chromosomes

Question 4

What phase of interphase does DNA duplicate?

Answer 4

S phase

Question 5

How long does mitosis last?

Answer 5

80 minutes

Question 6

When is nuclear membrane broken down?

Answer 6

Prometaphase

Question 7

When do chromosomes uncoil from a condensed state?

Answer 7

Telophase

Question 8

When do microtubuals form?

Answer 8

Prometaphase

Question 9

What type of cells does meiosis occur in?

Answer 9

Germ

Question 10

What is sinepsis?

Answer 10

Homologous chromosomes lying side by side during prophase I

Question 11

When does crossing over occur?

Answer 11

Prophase I

Question 12

What two events occur in meiosis that doesn’t occur in mitosis?

Answer 12

Sinepsis and in metaphase I when pairs of homologous chromosomes align independently.

Question 13

Are spermatogonium cells haploid or diploid?

Answer 13

Diploid

Question 14

Primary spermatocyte goes through:

Answer 14

meiosis

Question 15

Spermatoids go through:

Answer 15

differentiation to form sperm cells

Question 16

What happens in the embryo during oogenesis for females?

Answer 16

primordial germ cell undergoes mitosis to form oogonium (2n) which undergoes mitosis to form primary oocyte (2n stops in prophase I of meiosis I

Question 17

What happens during puberty for females?

Answer 17

Primary oocyte completes meiosis I to start meiosis II

Question 18

Explain the process of spermatogenesis:

Answer 18

1. Embryo: Primordial germ cell,mitosis, spermatogonium
2. From puberty onward, spermatogonium, mitosis to form primary spermotocyte
3. Primary Spermatocyte, meiosis I, secondary spermatocyte (n).
4. Secondary spermatocyte, meiosis II, spermatoids
5. Spermatoids, differentiation, sperm cells

Question 19

Describe the process of oogenesis:

Answer 19

1. In the embryo: primordial germ cells, mitosis, oogonium
2. Oogonium, mitosis, primary oocyte, stops in prophase I
3. Outside of embryo, primary oocyte, completes meiosis I, starts meiosis II, secondary oocyte
4. Secondary oocyte (n), ovulation, completes meiosis II after fertilization