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Prokaryotic cells divide by
mitosis.
cleavage.
cytokinesis.
binary fission.
meiosis.
The G1, S, and G2 phases of the cell cycle are collectively known as
interphase.
prophase.
mitosis.
meiosis.
metaphase.
Which cell cycle phase is not correctly matched to its description?
Cell growth - G1
Protein synthesis - S
Mitosis - M
Preparation of cell division - G2
During which mitotic stage is the spindle disassembled, the nuclear membrane formed
and the chromosomes uncoil?
Anaphase
Metaphase
Prophase
Telophase
Interphase
During which stage of the cell cycle does the synthesis of microtubules occur?
S phase
G2
G1
Telophase
Prophase
Mitosis occurs in germ cells.
True
False
Pairs of chromosomes that have the same size, shape, and function are called
a. sister chromatids
b. homologous chromosomes
c. heterologous chromosomes
d. daughter cells
Duplication of DNA occurs
twice, before meiosis I and meiosis II.
before meiosis II only.
during interphase.
during prophase I.
Genetic variability is possible because of ________ during or after meiosis.
independent assortment
crossing over
fertilization with a nonrelated gamete
All of these are correct.
Which of these is not a unique feature of meiosis?
Synapsis
Reduction division
Diploid daughter cells
Haploid daughter cells
The process that serves to decrease cellular chromosome number by half is
mitosis.
meiosis.
binary fission.
both mitosis and meiosis decrease chromosome number by half.
mitosis, meiosis, and binary fission all decrease chromosome number by
half.
The purpose of meiosis I is
to separate homologous chromosomes.
to replicate chromosomes.
to create 4 haploid cells.
to separate sister chromatids.
to repair errors in DNA synthesis.
Which is incorrect about meiosis?
Crossing over occurs in prophase I
Meiosis I results in 2 haploid cells
Sister chomatids separate in anaphase I
Meiosis II is like mitosis
Chromosome replication only occurs in interphase I
In humans, germ-line cells are in
the brain.
the muscle cells.
the kidneys.
the ovaries and testes.
the eyes.
All of the following are sources of genetic variety except
random fertilization.
independent assortment.
crossing over.
synapsis.