NGR6141 MODULE 3 EXAM 2025/2026
QUESTIONS AND ANSWERS 100% PASS
A person with Klinefelter syndrome has which of the following genetic abnormalities? -
ANS XXY
Individuals with the karyotype 47,XXY have Klinefelter syndrome.
A couple is planning to have children. The father is affected by an autosomal dominant disease,
but the mother does not have the disease gene. If the father is a heterozygote, what is the
chance that their first child will be affected by the autosomal dominant disease? - ANS 50%
Mating between a heterozygote with an autosomal dominant disease and a normal parent
carries a 50% risk of transmitting the disease gene.
Neurofibromatosis can vary in disease: - ANS expressivity.
Variability in disease expression is common to neurofibromatosis. Expression of the disease
ranges from café-au-lait spots to malignant skin tumors.
Steven has Duchenne muscular dystrophy. He inherited this condition from his: -
ANS mother only.
Duchenne muscular dystrophy is an X-linked recessive disorder. Steven inherited the abnormal
X-linked gene from his mother.
1 @COPYRIGHT 2025/2026
, Which of the following aneuploidy disorders is found only in females? - ANS Turner
syndrome
The karyotype of an individual with Turner syndrome does not involve the Y chromosome and
therefore cannot occur in males.
Chromosomal nondisjunction results in: - ANS monosomies and trisomies.
Nondisjunction, or failure of a chromosome to separate during meiosis, results in an ovum with
two copies of the chromosome and an ovum with no copies of the chromosome. When these
ova encounter a male gamete (sperm), the resulting embryo will have either an extra copy of
the chromosome (trisomy) or one copy of the chromosome (monosomy).
Which of the following statements about mutations is correct? - ANS Mutations are
alterations in normal DNA sequence.
Mutations are alterations in normal DNA sequence.
The triplet of base pairs necessary to code for a specific amino acid is called a: - ANS codon.
A codon is the triplet of base pairs necessary to code for a specific amino acid.
Down syndrome, Turner syndrome, and Klinefelter syndrome all manifest with which of the
following problems?
Sterility
None of the above
Severe mental retardation
Congenital heart defects - ANS None of the above
None of these problems are common to all three genetic disorders.
Mutations can result in abnormal: - ANS DNA, RNA, and proteins.
2 @COPYRIGHT 2025/2026
QUESTIONS AND ANSWERS 100% PASS
A person with Klinefelter syndrome has which of the following genetic abnormalities? -
ANS XXY
Individuals with the karyotype 47,XXY have Klinefelter syndrome.
A couple is planning to have children. The father is affected by an autosomal dominant disease,
but the mother does not have the disease gene. If the father is a heterozygote, what is the
chance that their first child will be affected by the autosomal dominant disease? - ANS 50%
Mating between a heterozygote with an autosomal dominant disease and a normal parent
carries a 50% risk of transmitting the disease gene.
Neurofibromatosis can vary in disease: - ANS expressivity.
Variability in disease expression is common to neurofibromatosis. Expression of the disease
ranges from café-au-lait spots to malignant skin tumors.
Steven has Duchenne muscular dystrophy. He inherited this condition from his: -
ANS mother only.
Duchenne muscular dystrophy is an X-linked recessive disorder. Steven inherited the abnormal
X-linked gene from his mother.
1 @COPYRIGHT 2025/2026
, Which of the following aneuploidy disorders is found only in females? - ANS Turner
syndrome
The karyotype of an individual with Turner syndrome does not involve the Y chromosome and
therefore cannot occur in males.
Chromosomal nondisjunction results in: - ANS monosomies and trisomies.
Nondisjunction, or failure of a chromosome to separate during meiosis, results in an ovum with
two copies of the chromosome and an ovum with no copies of the chromosome. When these
ova encounter a male gamete (sperm), the resulting embryo will have either an extra copy of
the chromosome (trisomy) or one copy of the chromosome (monosomy).
Which of the following statements about mutations is correct? - ANS Mutations are
alterations in normal DNA sequence.
Mutations are alterations in normal DNA sequence.
The triplet of base pairs necessary to code for a specific amino acid is called a: - ANS codon.
A codon is the triplet of base pairs necessary to code for a specific amino acid.
Down syndrome, Turner syndrome, and Klinefelter syndrome all manifest with which of the
following problems?
Sterility
None of the above
Severe mental retardation
Congenital heart defects - ANS None of the above
None of these problems are common to all three genetic disorders.
Mutations can result in abnormal: - ANS DNA, RNA, and proteins.
2 @COPYRIGHT 2025/2026
