In which phase of the cell cycle are chromosomes replicated?
G1 Phase
S Phase
M phase
G2 Phase
none of the above
If two chromosomes are homologous, they
look similar under the microscope
have very similar DNA sequences
carry the same types of genes
may carry different versions of the same gene
are all of the above
Checkpoints during the cell cycle are important because they
allow the organelle activity to catch up to cellular demands
ensure the integrity of the cell's DNA
allow the cell to generate sufficient ATP for cellular division
are the only time DNA replication can occur
do all of the above
Which of the following is a reason for mitotic cell division?
asexual reproduction
gamete formation in animals
multicellularity
all of the above
both a and c
A replicated chromosome is composed of
two homologous chromosomes held together at the centromere.
four sister chromatids held together at the centromere.
two sister chromatids held together at the centromere
four homologous chromosomes held together at the centromere.
one chromosome with a centromere.
Which of the following is not an event of anaphase of mitosis?
The nuclear envelope breaks apart
Sister chromatids separate
Kinetochore microtubules shorten, pulling the chromosomes to the poles.
Polar microtubules push against each other, moving the poles father apart.
All of the above occur during anaphase.
A student is looking at cells under the microscope. The cells are from an organism that has a diploid number of 14. In one particular case, the cell has seven replicated chromosomes (sister chromatids) aligned at the metaphase plate of the cell. Which of the following statements accurately describes the particular cell?
The cell is in metaphase of mitosis.
The cell is in metaphase of meiosis I.
The cell is in metaphase of meiosis II.
All of the above are correct.
Both b and c are correct.
Which of the following statements accurately describes a difference between mitosis and meiosis?
Mitosis may produce diploid cells, where as meiosis produces haploid cells.
Homologous chromosomes synapse during meiosis but do not synapse during mitosis.
Crossing over commonly occurs during meiosis, but it does not commonly occur during mitosis.
All of the above are correct
Both a and c are correct.
During crossing over in meiosis I,
homologous chromosomes are not altered.
homologous chromosomes exchange genetic material.
chromosomal damage occurs
genetic information is lost
cytokinesis occurs
Aneuploidy may be the result of
Duplication of a region of a chromosome
Inversion of a region of a chromosome
nondisjunction during meiosis
interspecies breeding
