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WorksheetsRC 2 Practice Questions
Total questions: 11
Worksheet time: 25mins
Different types of mutations can occur in the DNA. The diagram represents a type of mutation.
Which statement describes the mutation in the diagram?
A silent mutation results in the insertion of a different amino acid.
A substitution occurs with the adenine base.
A deletion of a cytosine base occurs.
A base is inserted into one strand of the DNA.
Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?
Differences in traits such as hair texture are determined by differences in —
the location of sugar groups in DNA
the sequence of nucleotides in DNA
the number of nitrogenous bases in DNA
the molecules attached to the phosphate in DNA
Researchers combined sequences of fruit-fly DNA from a gene for a particular trait with frog DNA. The mixture was heated to separate the DNA strands. Cooling allowed the single strands to form pairs. The researchers observed that some of the fruit-fly DNA paired with frog DNA.
The results provide evidence that —
similar nucleotides are present in both fruit-fly and frog DNA
fruit flies and frogs can be made to develop some of the same physical traits
heat can cause mutations in the DNA sequences of organisms
the replication of genetic material can occur at any temperature
In gel electrophoresis a DNA sample from an unknown donor is placed in a small well at one end of a special gel-coated plate. Samples from known donors are placed in other wells on the plate. An electric current is passed through the plate, causing the DNA fragments to separate. The size and location of the separated fragments can be compared for similarities. The more similar the locations and sizes of the fragments, the more closely the donors of the samples are related. The diagram shows four samples being compared with an unknown sample.
The donor of which sample is most closely related to the donor of the unknown sample?
Sample 1
Sample 2
Sample 3
Sample 4
In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p). What is the expected phenotypic ratio of the offspring of a BbPp × BbPp cross if these alleles sort independently?
16 black/polled : 0 black/horned : 0 red/polled : 0 red/horned
12 black/polled : 0 black/horned : 0 red/polled : 4 red/horned
4 black/polled : 4 black/horned : 4 red/polled : 4 red/horned
9 black/polled : 3 black/horned : 3 red/polled : 1 red/horned
Which of these is the direct result of an error in the transcription of a DNA nucleotide?
The nuclear membrane is ruptured.
Amino acids do not bond to tRNA.
A codon sequence is incorrect.
Transportation of mRNA does not occur.
Which diagram demonstrates how crossing-over contributes to genetic variety during meiosis?
A model of a biological process is shown.
What is the purpose of this process?
To replicate the DNA of an organism before cell division
To assemble nucleotides in an mRNA chain along a DNA template
To synthesize amino acids used to unzip strands of DNA and copy the genetic code
To translate the genetic code into a specific sequence of amino acids
A student used poster board to construct this model of a section of DNA.
Which statement describes this model of DNA?
The model is inaccurate because the base pairs are incorrect.
The model is accurate because it contains correctly paired bases.
The model is accurate because it shows each base splitting to form a double helix.
The model is inaccurate because some typical bases in DNA are missing.
The arctic fox inhabits northern areas of North America. The same arctic fox is shown in the drawing at different times of the year.
What causes this change in fur color?
The alleles for fur color change as the arctic fox grows older.
Gene expression for fur color is regulated by latitude.
The arctic fox has two traits for fur color that are determined at birth.
Gene expression for fur color is regulated by temperature.
