After the centromeres separate during mitosis, the chromatids move toward opposite poles of the spindle and after cytokinesis become _____________.
Acentrosomes
Bkinetochores
Chalf spindles
Ddaughter chromatids
Edaughter chromosomes
The microtubules of the mitotic spindle attach to a specialized structure in the centromere region of each chromosome called the:
Akinetochore.
Bnucleosome.
Cequatorial plate.
Dnucleotide.
Ecentrosome.
A cell entering mitosis with 48 chromosomes will produce two cells, each with:
A24 chromosomes.
B48 chromosomes.
C12 pairs of chromosomes.
D36 pairs of chromosomes.
E6 pairs of chromosomes.
When the centromeres divide and chromosomes begin to migrate, the mitotic stage is called:
AInterphase.
BTelophase.
CMetaphase.
DAnaphase.
EProfase.
Which of the following is true of daughter cells of meiosis I, but not true of daughter cells of mitosis?
AChromosomes have previously migrated to opposite poles.
BDNA from the original cell has been equally divided.
CHomologous chromosomes have been separated.
DThe cytoplasm of the original cell has divided.
EAll of the above are true of both processes.
Which of the above does NOT normally happen to homologs during meiosis?
Some gene exchange occurs.
Eventually, the homologs end up in different cells.
The separation of one pair of homologs is independent.
The genes controlling some functions will be absent from some gametes.
There will be no purely paternal and maternal chromosomes in the gametes formed.
After cytoplasmic division the result of meiosis II is:
ATwo diploid cells
BFour diploid cells
CTwo haploid cells
DFour haploid cells
EFour diploid cells and four haploid cells
Regulation of the cell cycle is dependent upon cyclins and cyclin-dependent kinases. The key(s) that allows a cell to progress beyond the restriction point is (are)
Acdk1 and cyclin B.
Bcyclin D and p21.
Ccyclin A and Cdk2.
Dphosphorylation of RB by Cdk4 and Cdk2
Eexternal signals from growth factors.
New gene combinations are created during the process of
mitosis.
spermatogenesis.
fertilization.
asexual reproduction.
both b and c are correct.
A human cell containing 22 autosomes and one Y chromosome is a
Asomatic cell of a male b. zygote c. somatic cell of a female
Da sperm e. an ovum
Some gene exchange occurs.
Eventually, the homologs end up in different cells.
The separation of one pair of homologs is independent.
The genes controlling some functions will be absent from some gametes.
There will be no purely paternal and maternal chromosomes in the gametes formed.
After cytoplasmic division the result of meiosis II is:
mitosis.
spermatogenesis.
fertilization.
asexual reproduction.
both b and c are correct.
A human cell containing 22 autosomes and one Y chromosome is a
