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WGU D115 OBJECTIVE ASSESSMENT (OA)
EXAM 2025-2026 COMPLETE UNIT 1-UNIT
7 QUESTIONS AND CORRECT DETAILED
ANSWERS Questions and Correct
Answers/ Latest Update / Already
Graded
Which type of genetic disease affects males more frequently than
females?
Sex-linked recessive
Autosomal recessive
Autosomal dominant
Sex-linked dominant
Ans: Sex-Linked recessive. Since males only have one X and one Y, if the
affected chromosome has the illness, it will be expressed.
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In which two conditions are chromosomal abnormalities the leading
known cause?
Intellectual disability
Respiratory disorders
Fetal miscarriage
Cardiovascular disease
Mental illness
Check My Answer
Ans: 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)
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Microscopy of cervical mucosa
Preimplantation genetic testing (PGT)
Amniocentesis
Ans: 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
WGU D115 OBJECTIVE ASSESSMENT (OA)
EXAM 2025-2026 COMPLETE UNIT 1-UNIT
7 QUESTIONS AND CORRECT DETAILED
ANSWERS Questions and Correct
Answers/ Latest Update / Already
Graded
Which type of genetic disease affects males more frequently than
females?
Sex-linked recessive
Autosomal recessive
Autosomal dominant
Sex-linked dominant
Ans: Sex-Linked recessive. Since males only have one X and one Y, if the
affected chromosome has the illness, it will be expressed.
,2|Page
In which two conditions are chromosomal abnormalities the leading
known cause?
Intellectual disability
Respiratory disorders
Fetal miscarriage
Cardiovascular disease
Mental illness
Check My Answer
Ans: 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)
, 3|Page
Microscopy of cervical mucosa
Preimplantation genetic testing (PGT)
Amniocentesis
Ans: 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
