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WGU C653 Heredity and Genetics Questions
and Correct Answers
A change occurs in one nucleotide of a triplet within a protein-
coding portion of a gene. This change results in a new triplet that
codes for a stop codon. What is this mutation called? Ans:
Nonsense mutation
A point mutation occurs in which a single nucleotide change
results in a codon that codes for a different amino acid. What is
this mutation called? Ans: Missense mutation
A single nucleotide is changed. What is this mutation called? Ans:
Point mutation
A point mutation occurs in which a single nucleotide change
results in a codon that codes for the same amino acid. What is this
mutation called? Ans: Sense mutation
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, 2 | Page
Which type of mutation is commonly linked to DNA breakage?
Ans: Radiation exposure
Which type of mutation can cause nucleotide substitutions, change
the number of nucleotides, or structurally change the nucleotides?
Ans: Chemical modification
How many chromosomes are present in a trisomal karyotype of
somatic cells if the gamete cells of a diploid organism have 23
chromosomes? Ans: 47
How many chromosomes are present in a triploidal karyotype of
somatic cells if the gamete cells of a diploid organism have 23
chromosomes? Ans: 69
What is 5n an example of? Ans: Polyploidy
What is 2n + 3 an example of? Ans: Pentasomy
Which process has one step that involves inserting segments of
DNA into plasmid vectors? Ans: Recombinant DNA
© 2025 All rights reserved
WGU C653 Heredity and Genetics Questions
and Correct Answers
A change occurs in one nucleotide of a triplet within a protein-
coding portion of a gene. This change results in a new triplet that
codes for a stop codon. What is this mutation called? Ans:
Nonsense mutation
A point mutation occurs in which a single nucleotide change
results in a codon that codes for a different amino acid. What is
this mutation called? Ans: Missense mutation
A single nucleotide is changed. What is this mutation called? Ans:
Point mutation
A point mutation occurs in which a single nucleotide change
results in a codon that codes for the same amino acid. What is this
mutation called? Ans: Sense mutation
© 2025 All rights reserved
, 2 | Page
Which type of mutation is commonly linked to DNA breakage?
Ans: Radiation exposure
Which type of mutation can cause nucleotide substitutions, change
the number of nucleotides, or structurally change the nucleotides?
Ans: Chemical modification
How many chromosomes are present in a trisomal karyotype of
somatic cells if the gamete cells of a diploid organism have 23
chromosomes? Ans: 47
How many chromosomes are present in a triploidal karyotype of
somatic cells if the gamete cells of a diploid organism have 23
chromosomes? Ans: 69
What is 5n an example of? Ans: Polyploidy
What is 2n + 3 an example of? Ans: Pentasomy
Which process has one step that involves inserting segments of
DNA into plasmid vectors? Ans: Recombinant DNA
© 2025 All rights reserved
