Bio Exam Unit 3 Quizzes

If there are 20 chromatids in a cell, how many centromeres are there?

10

Which term describes centromeres uncoupling, sister chromatids separating, and the two new chromosomes moving to opposite poles of the cell?

anaphase

Independent assortment of chromosomes occurs.

The statement is true for meiosis I only.

A gene's location along a chromosome is known as which of the following?

Locus

A cell divides to produce two daughter cells that are genetically different.

The statement is true for meiosis I only.

At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?

Metaphase

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?

Centrosome

Which of the following does *not* occur during mitosis?

replication of the DNA

If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?

20

Which of the following occurs in meiosis but not in mitosis?

Synapsis of chromosomes

A human cell containing 22 autosomes and a Y chromosome is

a sperm.

Movement of the chromosomes during anaphase would be most affected by a drug that

prevents shortening of microtubules.

In animals, meiosis results in gametes, and fertilization results in

zygotes.

How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G1 of the cell cycle?

The daughter cells have the same number of chromosomes and the same amount of DNA.

How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?

They have half the number of chromosomes and one-fourth the amount of DNA.

Cells that are in a nondividing state are in which phase?

G0

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Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei re-forming on either side of the cell plate. This cell is most likely

a plant cell in the process of cytokinesis.

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Chromatids are separated from each other.

The statement is true for mitosis and meiosis II.

DNA is replicated at this time of the cell cycle:

S

The centromere is a region in which

chromatids remain attached to one another until anaphase.

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in

cells with more than one nucleus.

If an organism is diploid and a certain gene found in the organism has 18 known alleles (variants), then any given organism of that species can/must have which of the following?

At most, 2 alleles for that gene

Which of the following is a function of those spindle microtubules that do not attach to kinetochores?

maintaining the region of overlap of fibers in the cell's center

If the DNA content of a diploid cell in the G1 phase of the cell cycle is *x*, then the DNA content of the same cell at metaphase of meiosis I would be

2*x*.

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Meiosis II is similar to mitosis in that

sister chromatids separate during anaphase.

Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do *all* sexual life cycles have in common? \n  I. Alternation of generations \n  II. Meiosis \n  III. Fertilization \n  IV. Gametes \n  V. Spores

II, III, and IV

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Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?

MPF

Homologous chromosomes move toward opposite poles of a dividing cell during

meiosis I.