Exam 5 Flashcards
Nucleosomes are made of
DNA and histone proteins
Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for all of the following functions except
Production of sperm and eggs
The chromosomes of eukaryotic cells are found in the
Nucleus
Chromatin consist of
DNA and proteins
A duplicate a chromosome consists of two
Centrosomes
Sister chromatids are joined at the
Centromere
Which of the following occurs during interphase?
Chromosome duplication occurs
The mitotic cell cycle results in the production of
To cells, each with the same amount of genetic material in the same genetic information
Which of the following occurs during prophase?
The mitotic spindle begins to form
Which of the following is a stage of mitosis?
Telophase
The correct sequence of stage of mitosis is
Prophase, metaphase, anaphase, telophase
During metaphase
Chromosomes line up in the middle of the cell
Which of these events occur during anaphase?
Sister chromatids become separate chromosomes
During telophase
The events of prophase are reversed
A cell that completed the cell cycle without undergoing cytokinesis would
Have two nuclei
Cytokinesis typically begins during the _____ stage of mitosis
Telophase
What is the difference between a benign and a malignant tumor?
Benign tumor is do not metastasize; malignant tumors do
Which of the following will help prevent cancer and increase survival?
Seeker early detection of tumors
Homologous chromosomes
Carry genes control in the same inherited characteristics
What chromosomes belong to a normal human male?
44 autosomes, One X chromosome, one Y chromosome
What chromosomes belong to a normal human female?
44 autosomes and 2 X chromosomes
Chromosomes that do not determine the sex of an individual or called
Autosomes
Sexual reproduction in humans
Allow a haploid sperm cell to fertilize a haploid egg cell
Plant cell cytokinesis differs from animal so cytokinesis because
Plant cells form a cell plate and animal cells do not
How much genetic material is present in a cell during prophase 1 compared to a cell that has completed meiosis 2
Four times as much
During metaphase one,
Homologous Chromosomes line up in the middle of the cell
Upon completion of televize one and cytokinesis there are
Two haploid cells
Which of the following is a characteristic seen in prophase one that does not occur in prophase two?
Crossing over occurs
Anaphase two is essentially the same as mitotic Anaphase except that in anaphase two____and in mitotic anaphase____
The cells are haploid and sister chromatids separate… The cells have the same number of chromosomes as the original cell and sister chromatids separate
The diagram of human life cycle shows that
Meiosis produces haploid sperm and egg cells
Genetic variation is accomplished by all but one of the following
The events of meiosis 2
Which of the following is the best description of the events of anaphase one
Homologous Chromosomes randomly separate and migrate to the opposite poles
In meiosis, how does prophase one differ from prophase two
During prophase one there is one diploid cell; during prophase there are two haploid cells
Crossing over during prophase one results in
Genetic recombination
A Karyotype would be unable to determine
Eye color
How many chromosomes can a gimme possess as a result of non-disjunction
n+1 or n-1
How many chromosomes does an individual with Turner syndrome have
2n-1
What is the chromosome number found in humans sells after meiosis one is completed?
22 autosomes and a sex chromosome
Which of these could lead to the mistake evident in the Karyotype?
A nondisjunction in meiosis two in gamete formation
The figure above shows that
Meiosis results in the formation of four haploid daughter cells
The 2n Number for the cell shown here is
Two sets
Lymphoid tissue’s cancer is a type of
Lymphoma
In crossing over, exchange of DNA segments occurs between
Non-sister chromatids of the homologous chromosome
The Karyotype above shows
Trisomy 21, a cause of Down syndrome
Which of the following may result when errors/mutation occurs in meiosis
A and B
Blood cancer is a type of
Leukemia
One possible result of chromosomal breakage is for a fragment to join a nonhomologous chromosome, this is called a
Translocation
When is amniocentesis usually done?
Between weeks 14 and 20 of pregnancy
Bone cancer is a type of
Sarcoma
Poison referred to treatments that attempt to stop cancer cells from dividing by interfering
With the mitotic spindle
Which one of the following mechanisms contributes to genetic variation?
A B and C
When is CVS Test usually done
During the first trimester
Individuals with down syndrome
I have an extra chromosome 21
Individuals with meta-female syndrome
Have an extra X-chromosome
In animals, somatic cells are produced by mitosis and____are produced by meiosis
Gametes
Which of the following terms mostly associated with the word synapsis, tetrads, and chiasmata
Crossing over
When can meiosis gone astray?
B and D
Which of the following happens at the conclusion of meiosis one
Homologous Chromosomes are separated
