Chapter 5: Cell Division ASSIGNMENT

A chromatid, which is found in the cell at the beginning of the S phase, is composed of __________.

DNA

During the S Stage of interphase, what is the cell synthesizing?

DNA

The haploid number of chromosomes is...

A condition in which only one kind of each chromosome is present inside the cell

During __________ __________, homologous chromosomes segregate in a random manner.

Independent assortment

A single cell called a __________ is formed by the fusion of gametes.

Zygote

Somatic cells are...

1) Able to undergo mitosis 2) Body cells

Cytokinesis begins during __________ and is completed just before the next __________.

1) Anaphase 2) Interphase

Meiosis produces genetic variation among gametes by way of which of the following events?

1) Crossing over 2) Independent assortment

The two events that are key to genetic variation are:

1) Crossing over 2) Independent assortment

During telophase which of the following events occur?

1) Nuclear envelope reforms 2) Spindle disappears

A cell in telophase would have which of the following characteristics?

1) Nuclear envelopes reform 2) Nucleoli reappear 3) Chromatin is present

Which events occur during Telophase I?

1) Spindle disappears 2) Nuclear envelope reforms

Choose the events that occur in both mitosis and meiosis:

1) Spindle fibers attach to centromeres 2) Sister chromatids separate 3) Disintegration of the nuclear envelopes

Tumor suppressor genes encode proteins that...

1) Stop the cell cycle 2) Promote apoptosis

Sister chromatids are:

1) The components of a replicated chromosome 2) Identical to one another

Rank the events of Meiosis II according to the one that occurs first to the cytokinesis: 1) Each chromatid of a replicated chromosome attaches to the spindle 2) A spindle appears and the nuclear envelope disassembles 3) Chromosomes align at the center of the cell 4) Sister chromatids are separated

2) A spindle appears and the nuclear envelope disassembles 1) Each chromatid of a replicated chromosome attaches to the spindle 3) Chromosomes align at the center of the cell 4) Sister chromatids are separated

Place the sequence of events of apoptosis in their correct order: 1) Chromatin condenses and the nucleus fragments 2) The cell fragments with each containing DNA fragments 3) Cell rounds up and nucleus collapses 4) The plasma membrane blisters and biebs form

3) Cell rounds up and nucleus collapses 1) Chromatin condenses and the nucleus fragments 4) The plasma membrane blisters and biebs form 2) The cell fragments with each containing DNA fragments

List the four stages of mitosis in the correct sequence: 1) Telophase 2) Metaphase 3) Prophase 4) Anaphase

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

What type of cytoskeletal structure is involved in the production of a cleavage furrow?

Actin filaments

What is the mitotic phase during which sister chromatids move toward the poles of the spindle?

Anaphase

The repeating sequence of events in eukaryotes that involves cell growth and cell division and includes the stages G1, S, G2, and Mitosis is called the __________ __________.

Cell cycle

A duplicated chromosome has tow sister chromatids connected together at a __________.

Centromere

Match the stage of interphase with the events of that phase: S

DNA is replicated

A human body cell has 23 pairs of chromosomes, or 46 total chromosome; it is therefore considered a __________ cell.

Diploid

Fertilization is the...

Fusion of sperm and egg nuclei, producing a zygote that develops into a new individual

__________ are haploid sex cells (such as sperm and eggs).

Gametes

The mixture of DNA and protein...

Make up chromatin

The type of nuclear division that occurs as part of sexual reproduction, in which the daughter cells receive the haploid number of chromosomes in varied combinations is __________.

Meiosis

__________ occurs only in reproductive organs in the human body and produces gametes.

Meiosis

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

Metaphase

During __________ of Meiosis, homologous pairs of chromosomes align independently at the equator.

Metaphase I

Which of the following distributes daughter chromosomes to daughter nuclei during the process of cell division?

Mitosis

Match the stage of interphase with the events of that phase: G1

Organelles are doubled and needed materials are accumulated

During which phase of mitosis will spindle fibers begin to form and chromatin condense?

Prophase

__________ is the first phase of Meiosis

Prophase I

Genetic variability is the main advantage of __________ __________.

Sexual reproduction

Daughter chromosomes are produced when...

Sister chromatids separate

Mitosis is the portion of the cell cycle in which...

The cell divides its DNA

Match the stage of interphase with the events of that phase: G2

The cell makes the final preparations to divide

Cytokinesis is the portion of the cell cycle during which...

The cytoplasm and organelles of the cell are divided