RIO BIO 156 EXAMINATION TEST 2025/2026 QUESTIONS
AND ANSWERS GRADED A+
✔✔Many genetic disorders of humans are caused by - ✔✔recessive alleles.
✔✔The vast majority of people afflicted with recessive disorders are born to parents
who were - ✔✔not affected at all by the disease.
✔✔Which one of the following is an example of incomplete dominance in humans? -
✔✔hypercholesterolemia
✔✔Imagine that beak color in a finch species is controlled by a single gene. You mate a
finch homozygous for orange (pigmented) beak with a finch homozygous for ivory
(unpigmented) beak and get numerous offspring, all of which have a pale, ivory-orange
beak. This pattern of color expression is most likely to be an example of -
✔✔incomplete dominance.
✔✔The expression of both alleles for a trait in a heterozygous individual illustrates -
✔✔codominance
✔✔A person with AB blood illustrates the principle of - ✔✔codominance
✔✔Genetic testing can reveal - ✔✔a person's chances of developing a disease.
✔✔What is the normal complement of sex chromosomes in a human male? - ✔✔one X
chromosome and one Y chromosome
✔✔How many sex chromosomes are in a human gamete - ✔✔1
✔✔What is meant by the statement that "male bees are fatherless"? - ✔✔Male bees
develop from unfertilized eggs.
✔✔Why are sex-linked conditions more common in men than in women? - ✔✔Why are
sex-linked conditions more common in men than in women?
✔✔Mendel conducted his most memorable experiments on - ✔✔peas
✔✔A color-blind woman mates with a man who is not color-blind. All of the sons and
none of the daughters are color-blind. What is the best explanation of this result? -
✔✔The gene for color vision is linked to the X chromosome.
✔✔Which of the following people conducted experiments that demonstrated that DNA is
the genetic material of bacteriophages? - ✔✔Hershey and Chase
, ✔✔When a T2 bacteriophage infects an E. coli cell, what part of the phage enters the
bacterial cytoplasm? - ✔✔only the DNA
✔✔The way that genetic material of a bacteriophage enters a bacterium is most like the
way that - ✔✔a drug is injected with a hypodermic needle.
✔✔The monomers of DNA and RNA are - ✔✔nucleotides
✔✔The shape of a DNA molecule is most like - ✔✔a twisted rope ladder.
✔✔DNA replication - ✔✔uses each strand of a DNA molecule as a template for the
creation of a new strand.
✔✔If one strand of DNA is CGGTAC, the corresponding strand would be - ✔✔GCCATG
✔✔When one DNA molecule is copied to make two DNA molecules, the new DNA
contains - ✔✔50% of the parent DNA
✔✔Which one of the following sequences best describes the flow of information when a
gene directs the synthesis of a cellular component? - ✔✔DNA RNA protein
✔✔The transfer of genetic information from DNA to RNA is called - ✔✔transcription
✔✔Experiments have demonstrated that the "words" of the genetic code (the units that
specify amino acids) are - ✔✔three-nucleotide sequences.
✔✔We would expect that a 15-nucleotide sequence will direct the production of a
polypeptide that consists of - ✔✔5 amino acids.
✔✔Where do transcription and translation occur in prokaryotic cells? - ✔✔in the
cytoplasm
✔✔Translation consists of which of the following? - ✔✔the conversion of genetic
information from the language of nucleic acids to the language of proteins
✔✔Any change in the nucleotide sequence of DNA is called - ✔✔a mutation.
✔✔A physical or chemical agent that changes the nucleotide sequence of DNA is called
- ✔✔a mutagen.
✔✔The envelope of a flu virus - ✔✔helps the virus enter the cell
AND ANSWERS GRADED A+
✔✔Many genetic disorders of humans are caused by - ✔✔recessive alleles.
✔✔The vast majority of people afflicted with recessive disorders are born to parents
who were - ✔✔not affected at all by the disease.
✔✔Which one of the following is an example of incomplete dominance in humans? -
✔✔hypercholesterolemia
✔✔Imagine that beak color in a finch species is controlled by a single gene. You mate a
finch homozygous for orange (pigmented) beak with a finch homozygous for ivory
(unpigmented) beak and get numerous offspring, all of which have a pale, ivory-orange
beak. This pattern of color expression is most likely to be an example of -
✔✔incomplete dominance.
✔✔The expression of both alleles for a trait in a heterozygous individual illustrates -
✔✔codominance
✔✔A person with AB blood illustrates the principle of - ✔✔codominance
✔✔Genetic testing can reveal - ✔✔a person's chances of developing a disease.
✔✔What is the normal complement of sex chromosomes in a human male? - ✔✔one X
chromosome and one Y chromosome
✔✔How many sex chromosomes are in a human gamete - ✔✔1
✔✔What is meant by the statement that "male bees are fatherless"? - ✔✔Male bees
develop from unfertilized eggs.
✔✔Why are sex-linked conditions more common in men than in women? - ✔✔Why are
sex-linked conditions more common in men than in women?
✔✔Mendel conducted his most memorable experiments on - ✔✔peas
✔✔A color-blind woman mates with a man who is not color-blind. All of the sons and
none of the daughters are color-blind. What is the best explanation of this result? -
✔✔The gene for color vision is linked to the X chromosome.
✔✔Which of the following people conducted experiments that demonstrated that DNA is
the genetic material of bacteriophages? - ✔✔Hershey and Chase
, ✔✔When a T2 bacteriophage infects an E. coli cell, what part of the phage enters the
bacterial cytoplasm? - ✔✔only the DNA
✔✔The way that genetic material of a bacteriophage enters a bacterium is most like the
way that - ✔✔a drug is injected with a hypodermic needle.
✔✔The monomers of DNA and RNA are - ✔✔nucleotides
✔✔The shape of a DNA molecule is most like - ✔✔a twisted rope ladder.
✔✔DNA replication - ✔✔uses each strand of a DNA molecule as a template for the
creation of a new strand.
✔✔If one strand of DNA is CGGTAC, the corresponding strand would be - ✔✔GCCATG
✔✔When one DNA molecule is copied to make two DNA molecules, the new DNA
contains - ✔✔50% of the parent DNA
✔✔Which one of the following sequences best describes the flow of information when a
gene directs the synthesis of a cellular component? - ✔✔DNA RNA protein
✔✔The transfer of genetic information from DNA to RNA is called - ✔✔transcription
✔✔Experiments have demonstrated that the "words" of the genetic code (the units that
specify amino acids) are - ✔✔three-nucleotide sequences.
✔✔We would expect that a 15-nucleotide sequence will direct the production of a
polypeptide that consists of - ✔✔5 amino acids.
✔✔Where do transcription and translation occur in prokaryotic cells? - ✔✔in the
cytoplasm
✔✔Translation consists of which of the following? - ✔✔the conversion of genetic
information from the language of nucleic acids to the language of proteins
✔✔Any change in the nucleotide sequence of DNA is called - ✔✔a mutation.
✔✔A physical or chemical agent that changes the nucleotide sequence of DNA is called
- ✔✔a mutagen.
✔✔The envelope of a flu virus - ✔✔helps the virus enter the cell
