WorksheetsGenetics and the Environment Quiz
Total questions: 50
Worksheet time: 26mins
Which of the following is the molecular cause of sickle cell anemia?
Deletion of a base in the gene encoding hemoglobin
Substitution of adenine for thymine in the gene encoding hemoglobin
A duplication of the hemoglobin gene
Insertion of a nucleotide in the hemoglobin gene
Cystic fibrosis is caused by mutations in which gene?
CFTR
BRCA1
TP53
HBB
The molecular basis of phenylketonuria (PKU) is due to a deficiency in which enzyme?
Phenylalanine hydroxylase
Tyrosinase
Homogentisate oxidase
Branched-chain amino acid transaminase
In a dihybrid cross (AaBb × AaBb), what is the probability of producing an offspring with the genotype AABb?
1/16
1/4
1/8
1/2
What is the expected phenotypic ratio of a cross between two heterozygous individuals (Tt × Tt) for a simple Mendelian trait?
1:1
3:1
2:2
1:2:1
In incomplete dominance, the heterozygous genotype results in:
A phenotype that is intermediate between the two homozygous phenotypes
A phenotype identical to the dominant homozygote
A phenotype identical to the recessive homozygote
A completely new phenotype
Which of the following is an example of codominance?
Red and white flower crossing to produce pink flowers
A person with type AB blood
A blue cat crossed with a yellow cat to produce green cats
A person with sickle cell anemia
The genetic code is considered universal because:
It is the same in all living organisms
It can be translated into different proteins
It codes for all types of mutations
It is found in all organisms' mitochondria
Which of the following is the correct sequence of amino acids specified by the codons: AUG, GCU, UAC?
Methionine, alanine, tyrosine
Methionine, tyrosine, alanine
Tyrosine, methionine, alanine
Alanine, methionine, tyrosine
Which of the following mutations does NOT alter the amino acid sequence of the resulting protein?
Silent mutation
Missense mutation
Nonsense mutation
Frameshift mutation
A mutation that results in the premature termination of a protein is called a:
Frameshift mutation
Missense mutation
Nonsense mutation
Silent mutation
A mutation that changes a single nucleotide but results in a codon that still codes for the same amino acid is known as a:
Frameshift mutation
Silent mutation
Missense mutation
Nonsense mutation
In a pedigree chart, a circle represents:
Male
Female
Affected individual
Unaffected individual
What does a double line between two individuals in a pedigree typically indicate?
They are unrelated
They are cousins
They are siblings
They are married or in a consanguineous relationship
Which of the following best describes a dominant genetic disorder in a pedigree?
It appears in every generation
It skips generations
Affected individuals are always homozygous
Only males are affected
Which of the following is true about recessive inheritance?
It can be passed on by carriers who do not show symptoms
Only affected individuals can transmit the gene
It affects males more than females
It is usually expressed in the heterozygous state
In a pedigree, a shaded square represents:
Male
Female
An unaffected individual
An affected male
Which of the following genetic disorders is caused by a single nucleotide mutation?
Cystic fibrosis
Sickle cell anemia
Huntington's disease
Down syndrome
Cystic fibrosis is caused by a mutation in which gene?
BRCA1
CFTR
HBB
TP53
Which of the following mutations is responsible for Huntington's disease?
Deletion of a gene
Insertion of a trinucleotide repeat
Missense mutation
Silent mutation
Which genetic disorder is caused by a deletion of a part of chromosome 5?
Down syndrome
Cri du chat syndrome
Klinefelter syndrome
Turner syndrome
In a Mendelian cross between two heterozygous pea plants (Pp × Pp), what is the probability of producing an offspring with the recessive phenotype?
0%
25%
50%
75%
In a cross of heterozygous pea plants (Pp × Pp), what is the probability of producing an offspring with the recessive phenotype?
0%
25%
50%
75%
What is the expected genotypic ratio from a cross between two heterozygous individuals (Aa × Aa)?
1:1
3:1
1:2:1
2:1
A homozygous dominant individual is crossed with a homozygous recessive individual. What is the expected phenotype ratio in the F1 generation?
3:1
1:1
100% dominant phenotype
100% recessive phenotype
Which of the following is an example of incomplete dominance?
A red flower crossed with a white flower results in pink flowers.
A person with AB blood type.
A person with a sickle cell disease phenotype.
A black and white cat producing a grey cat.
Which of the following best describes codominance?
The heterozygous individual shows a phenotype that is a blend of the two alleles.
Both alleles are equally expressed in the heterozygote.
One allele is dominant over the other.
The gene has multiple alleles.
What does the sequence AUG in messenger RNA (mRNA) code for?
Glycine
Methionine
Leucine
Serine
What is the role of transfer RNA (tRNA) during translation?
It synthesizes mRNA from DNA.
It transports amino acids to the ribosome.
It catalyzes the formation of peptide bonds.
It transcribes DNA into RNA.
Which of the following is an example of a silent mutation?
A nucleotide change that results in a different amino acid.
A nucleotide change that does not affect the amino acid sequence.
A nucleotide change that creates a stop codon.
A nucleotide insertion that shifts the reading frame.
Which type of mutation leads to a frameshift?
Missense mutation
Nonsense mutation
Insertion or deletion of nucleotides
Silent mutation
A mutation that changes a codon to a stop codon is called a:
Missense mutation
Nonsense mutation
Silent mutation
Frameshift mutation
In a pedigree, a circle represents:
Male
Female
Affected individual
Unaffected individual
What does a double line between two individuals in a pedigree typically indicate?
They are unrelated
They are cousins
They are siblings
They are married or in a consanguineous relationship
What is the phenotypic ratio expected from a cross between two heterozygous individuals (Aa × Aa) for a simple Mendelian trait?
1:1
3:1
1:2:1
2:1
A person who is a carrier of a recessive genetic disorder has what genotype?
Homozygous dominant
Homozygous recessive
Heterozygous
Homozygous for both alleles
Which of the following is most likely to be affected in an X-linked recessive disorder?
Females
Males
Both males and females equally
Males and females in equal numbers
Which of the following genetic disorders is caused by a single nucleotide mutation?
Cystic fibrosis
Sickle cell anemia
Huntington's disease
Down syndrome
Which gene is mutated in cystic fibrosis?
CFTR
BRCA1
HBB
TP53
What causes Huntington's disease?
A single nucleotide polymorphism
Expansion of a trinucleotide repeat
Chromosomal translocation
Gene deletion
Which of the following mutations causes Duchenne muscular dystrophy?
Point mutation
Chromosomal translocation
Gene deletion
Insertion mutation
Which genetic disorder results from a deletion in the short arm of chromosome 5?
Down syndrome
Cri du Chat syndrome
Turner syndrome
Klinefelter syndrome
Which type of mutation results in a premature stop codon?
Missense mutation
Nonsense mutation
Silent mutation
Frameshift mutation
Which of the following is a frameshift mutation?
Insertion of a nucleotide
Substitution of a single nucleotide
Deletion of a codon
Duplication of a gene
If there are 2 plants with the genotypes TT and Tt then the plants would have
the same phenotype
different phenotypes
What did Gregor Mendel study with the pea plants?
cross pollination
inheritance of traits
flowering
If an organism has 2 identical alleles for a particular trait then it is
heterozygous
homozygous
hybrid
If the parents are X H X h and X h Y, then what is the percentage that the children will have the recessive trait.
50%
25%
75%
If a Heterozygous Rr pea plant is crossed with a Heterozygous Rr pea plant, what would be the percentage that the offspring will be recessive rr?
50%
75%
25%
A cross involving a single trait is known as?
dihybrid
monohybrid
hybrid
