True or False: A chromosomal ablation is an alteration to the
chromosome that results in a change to the total number of
chromosomes, deletions or additions to the chromosome, or even
complete rearrangement of chromos
...
True or False: A chromosomal ablation is an alteration to the
chromosome that results in a change to the total number of
chromosomes, deletions or additions to the chromosome, or even
complete rearrangement of chromosomal segments.
True
Corrrreecctt!! False
Question 2 2 / 2 pts
True or False: Sex chromosomes can occur in pairs but also exist
alone with no phenotypic consequence.
True
Corrrreecctt!! False
Question 3 2 / 2 pts
True or False: Trisomy and monosomy in autosomal
chromosomes are generally not tolerated in animals or plants.
True
Corrrreecctt!! False
Question 4 4 / 4 pts
Your Answer:
What is the only trisomy disorder in which individuals routinely live
longer than one year? The incidence of this disorder seems to
increase with an increased age in which parent?
down syndrome
the mother
Down syndrome (trisomy 21) is trisomy disorder in
which individuals routinely live longer than one year,
the incidence of which seems to increase with maternal
age.
Question 5 2 / 2 pts
True or False: Individuals that are afflicted with Down syndrome
typically exhibit only a subset of the stereotypical characteristics of
the disorder.
Corrrreecctt!! True
False
Question 6 2 / 2 pts
The DSCR region thought to be typically responsible for the Down
syndrome phenotype is located on chromosome _____.
20
Corrrreecctt!! 21
3
8
Question 7 6 / 6 pts
Your Answer:
Why do researchers think that individuals with Down syndrome are
protected from cancers that cause solid tumors?
because of a gene called DSCR1 that encodes for protein that
blocks vascular epithelial growth factor. the tumors cant grow
when this function is blocked
The DSCR region that is responsible for the phenotype
of Down syndrome holds a gene called DSCR1, which
encodes for a protein that blocks VEGF (vascular
epithelial growth factor). VEGF stimulates the growth
of blood vessels, which is extremely important for the
vasculature of tumor cells. By blocking VEGF, tumor
cells cannot develop the vasculature necessary for the
support of tumor growth.
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