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WGU D115 UNIT 2 EXAM QUESTIONS AND ANSWERS (Learning Check questions)
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WGU D115 UNIT 2 EXAM QUESTIONS ANDANSWERS (Learning Check questions)
Which type of genetic disease affects males more frequently than females?
Sex-linked recessive
Autosomal recessive
Autosomal dominant
Sex-linked dominant - -Sex-Linked recessive. Since males only have one X
and one Y, if the affected chromosome has the illness, it will be expressed.
-In which two conditions are chromosomal abnormalities the leading known
cause?
Intellectual disability
Respiratory disorders
Fetal miscarriage
Cardiovascular disease
Mental illness
Check My Answer - -Intellectual disability and fetal miscarriage.
Chromosome abnormalities are the leading known cause of intellectual
disability and fetal miscarriage.
-What are three examples of prenatal diagnostic studies?
Drug-sensitivity testing
Chorionic villus sampling (CVS)
Microscopy of cervical mucosa
Preimplantation genetic testing (PGT)
Amniocentesis - -Chorionic villus sampling (CVS), amniocentesis, and
preimplantation genetic testing (PGT) are examples of prenatal diagnostic
studies and are performed in vitro. CVS is a form of genetic testing that
provides genetic information found in utero and is usually performed
between weeks 11 and 14 of pregnancy. An amniocentesis is a form of
genetic testing that evaluates amniotic fluid and is usually performed during
the second trimester, between weeks 15 and 20 of pregnancy. PGT is
performed on the embryo prior to implantation.
-Which genetic disorder is characterized by the presence of a zygote having
one chromosome with a normal complement of genes and one chromosome
with a missing gene?
Klinefelter syndrome
Down syndrome
Cri du chat syndrome
Turner syndrome - -Cri du chat syndrome (translated as "cry of the cat") is
caused by a DNA deletion. This term describes the cry often heard from a
, baby affected by the syndrome. Cri du chat syndrome can present as a
microcephalic, low birth-weight baby with a piercing cry.
-How can an X-linked recessive disease skip generations?
Mothers cannot pass X-linked genes to their sons.
Females are hemizygous for the X chromosome.
The disease can be transmitted through female carriers.
These diseases need only one copy of the gene in females. - -The disease
can be transmitted through female carriers.
Since females have two copies of the X chromosome, the mother may
provide an unaffected X to a daughter or son. Furthermore, a daughter may
not show signs of the disease because she has the other X (the only X the
father can give to a female) to cancel it out.
-Which type of risk is referred to as the ratio of the disease rate among the
entire population to the disease rate in an unexposed population?
Relative
Attributable
Contingency
Causal - -Relative risk is a ratio of probability, not an actual occurrence of
disease.
-What are the empirical risks for most multifactorial diseases based on?
Direct observation
Chromosomal testing
Relative risks
Liability thresholds - -Many factors from lifestyle to genetics affect
multifactorial diseases. Observation and evaluation of each case individually
provides the most thorough and accurate assessment.
-What refers to the silenced gene of a gene pair.
Imprinted, activated, mutated, altered - -The imprinted gene is the silent
gene of a gene pair.
-What is the primary reason that some older adults have impaired
inflammation and wound healing?
The circulatory system cannot adequately perfuse tissues.
The underlying chronic illness exists.
The complement is deficient.
The number of mast cells is insufficient. - -The underlying chronic illness
exists.
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