GENETICS EXAM AND ITS
REVIEWED ANSWERS
The inheritance of both copies of a homologous
chromosome pair from one parent is know as
A. Fragile sites
B. Nondisjunction
C. Uniparental disomy
D. Copy number variants
E. Chromosomal breakage
C
Because Marfan Syndrome is an autosomal dominant
disorder
A.All affected individuals must be homozygous
dominant
B. Both parents must have Marfan Syndrome in order
to have a child with the condition
C. Affected individuals are typically short in stature
and have usually strong connective tissue
D. At least one parent must have Marfan syndrome in
order to have a child with the condition
E. Affected individuals must inherit recessive alleles
from both parents to express the condition
D
The most common chromosomal disorder is____,
which is characterized by ____
A. Teraploidy; one extra set of chromosomes
B. Patau syndrome; an extra copy of chromosome 13
,C. Edwards syndrome; an extra copy of chromosome
18
D. Autosomy; two extra sets of chromosomes
E. Down syndrome; an extra copy of chromosome 21
E
One method of harvesting fetal cells for karyotype
analysis involves removing some of the fluid
surrounding the fetus. This is known as ________ and
is performed ________.
A. Free fetal DNA; before pregnancy
B. Amniocentesis; sixteenth week of pregnancy
C. Amniocentesis; thirsty weeks of pregnancy
D. Free fetal DNA; sixteenth week of pregnancy
E. Chorionic villus sampling; ten to twelve weeks of
pregnancy
B
A pedigree analysis
A. Can reveal autosomal but not sex-linked traits
B. Always reveals the inheritance pattern of a genetic
trait
C. Is useful for genetic studies due to the large sizes
of typical families
D. Is useful for predicting the risk of passing a genetic
condition onto ones offspring
E. Cannot be used for predicting the risk of adults
developing symptoms of a genetic condition
D
Aneuploidy is most often caused by ________, the
failure of chromosomes to separate during meiosis.
A. Inversion
B. Polyploidy
, C. Monosomy
D. Miscarriage
E. Nondisjunction
E
In crosses involving complete dominance, the F2
genotype ratio is 1:2:1 and is expressed as a
phenotypic____ ratio
A. 1:1:1:1
B. 1:1
C. 1:3
D. 9:3:3:1
E. 3:1
E
A locus is___
A. The site of crossing over
B. An alternate form of a gene
C. The location of a gene on a chromosome
D. A mutation of a gene to an alternate state
E. The chromosome location of the centromere
C
Cystic fibrosis is characterized by
A. Excess mucus production
B. Insufficient mucus production
C. Autosomal dominant inheritance
D. Abnormal lung function, but normal pancreatic
function
E. Normal lung function, but abnormal pancreatic
function
A
The offspring (F1) resulting from the cross between
two red flowered plants are 3/4 red and 1/4 white. The
REVIEWED ANSWERS
The inheritance of both copies of a homologous
chromosome pair from one parent is know as
A. Fragile sites
B. Nondisjunction
C. Uniparental disomy
D. Copy number variants
E. Chromosomal breakage
C
Because Marfan Syndrome is an autosomal dominant
disorder
A.All affected individuals must be homozygous
dominant
B. Both parents must have Marfan Syndrome in order
to have a child with the condition
C. Affected individuals are typically short in stature
and have usually strong connective tissue
D. At least one parent must have Marfan syndrome in
order to have a child with the condition
E. Affected individuals must inherit recessive alleles
from both parents to express the condition
D
The most common chromosomal disorder is____,
which is characterized by ____
A. Teraploidy; one extra set of chromosomes
B. Patau syndrome; an extra copy of chromosome 13
,C. Edwards syndrome; an extra copy of chromosome
18
D. Autosomy; two extra sets of chromosomes
E. Down syndrome; an extra copy of chromosome 21
E
One method of harvesting fetal cells for karyotype
analysis involves removing some of the fluid
surrounding the fetus. This is known as ________ and
is performed ________.
A. Free fetal DNA; before pregnancy
B. Amniocentesis; sixteenth week of pregnancy
C. Amniocentesis; thirsty weeks of pregnancy
D. Free fetal DNA; sixteenth week of pregnancy
E. Chorionic villus sampling; ten to twelve weeks of
pregnancy
B
A pedigree analysis
A. Can reveal autosomal but not sex-linked traits
B. Always reveals the inheritance pattern of a genetic
trait
C. Is useful for genetic studies due to the large sizes
of typical families
D. Is useful for predicting the risk of passing a genetic
condition onto ones offspring
E. Cannot be used for predicting the risk of adults
developing symptoms of a genetic condition
D
Aneuploidy is most often caused by ________, the
failure of chromosomes to separate during meiosis.
A. Inversion
B. Polyploidy
, C. Monosomy
D. Miscarriage
E. Nondisjunction
E
In crosses involving complete dominance, the F2
genotype ratio is 1:2:1 and is expressed as a
phenotypic____ ratio
A. 1:1:1:1
B. 1:1
C. 1:3
D. 9:3:3:1
E. 3:1
E
A locus is___
A. The site of crossing over
B. An alternate form of a gene
C. The location of a gene on a chromosome
D. A mutation of a gene to an alternate state
E. The chromosome location of the centromere
C
Cystic fibrosis is characterized by
A. Excess mucus production
B. Insufficient mucus production
C. Autosomal dominant inheritance
D. Abnormal lung function, but normal pancreatic
function
E. Normal lung function, but abnormal pancreatic
function
A
The offspring (F1) resulting from the cross between
two red flowered plants are 3/4 red and 1/4 white. The
