Ch 18 Practice

Question 1

Diring which stage of cell division foes the nucleus divide?

Answer 1

Mitosis

Question 2

The DNA of a cell is organized into ______.

Answer 2

Chromosomes

Question 3

A cell with a 20 diploid number of chromosomes will have how many after meiosis?

Answer 3

10; meiosis is a reduction division

Question 4

What is the sequence of the 4 stages of mitosis?

Answer 4

1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

Question 5

During ______ I of meiosis homologous pairs of chromosomes align along the equator (center) of the spindle.

Answer 5

Metaphase

Question 6

A normal human with 22 pairs of autosomes and the sex chromosomes X and Y will be:

Answer 6

Male

Question 7

______ I is the first phase of meiosis.

Answer 7

Prophase

Question 8

During human gametogenesis, spermatogenesis produces ______, while oogenesis produces ______.

Answer 8

Haploid sperm; haploid eggs

Question 9

The purpose of ______ is to produce two, identical daughter cells.

Answer 9

Mitosis

Question 10

List the cells of spermatogenesis in the order that they are produced.

Answer 10

1. Primary spermatocyte
2. Secondary spermatocyte
3. Spermatids
4. Sperm

Question 11

During which phase of the cell does DNA replicate to form sister chromatids?

Answer 11

S phase

Question 12

Place the events and cells produced during oogenesis in the correct sequence.

Answer 12

1. Primary oocyte
2. Secondary oocyte
3. Fertilization
4. Fusion of egg and sperm nuclei forming a zygote

Question 13

______ is programmed cell death.

Answer 13

Apoptosis

Question 14

A ______ is the attachment point of two sister chromatids.

Answer 14

Centromere

Question 15

Gametes fuse during fertilization to form a ______.

Answer 15

Diploid zygote

Question 16

Binary fission is a form of ______ reproduction.

Answer 16

Asexual

Question 17

List the phases of interphase in the correct sequence.

Answer 17

1. G1
2. S
3. G2

Question 18

What is a Barr body?

Answer 18

An inactive X chromosome

Question 19

If an egg with 22 chromosomes is fertilized by a normal sperm with 23 chromosomes the resultant zygote is called a ______.

Answer 19

Monosomy

Question 20

If an egg with 24 chromosomes is fertilized by a normal sperm with 23 chromosomes the result is a ______.

Answer 20

Trisomy

Question 21

Paired chromosomes in a cell in which members of the pair have genes for the same traits are called ______.

Answer 21

Homologous chromosomes

Question 22

List the events of cell cycle control in the correct sequence.

Answer 22

1. Growth factor binds to membrane receptor
2. Receptor relays a signal to proteins in the cytoplasm of the cell
3. Cytoplasmic protein activates specific genes
4. Cell cycle is either inhibited or activated depending on the original signal

Question 23

List characteristics of Turner syndrome:

Answer 23

• Underdeveloped uterus
• Broad chest
• Folds of skin on the neck
• Underdeveloped ovaries

Question 24

______ is the mitotic phase during which chromosomes are aligned along the center plane (equator) of the cell.

Answer 24

Metaphase

Question 25

A picture of a person's chromosomes (shown) that are arranged in pairs and that is used to detect genetic abnormalities is called a ______.

Answer 25

Karyotype

Question 26

A cell is considered ______ if two of each type of chromosome are present inside the cell.

Answer 26

Diploid

Question 27

The division of the cytoplasm that accompanies mitosis and meiosis is called ______.

Answer 27

Cytokinesis