Heredity & Genetics C652 Practice Exam Questions And Correct Answers.
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Course
WGU C652
Institution
WGU C652
Triploidy - Answer is a rare chromosomal abnormality in which fetuses are born with an extra set of chromosomes in their cells. Three sets, or 69 chromosomes
missense - Answer a single nucleotide change results in a codon that codes for a different amino acid
nonsense - Answer in a s...
Heredity & Genetics C652 Practice Exam
Questions And Correct Answers.
Triploidy - Answer is a rare chromosomal abnormality in which fetuses are born with an extra set of
chromosomes in their cells. Three sets, or 69 chromosomes
missense - Answer a single nucleotide change results in a codon that codes for a different amino acid
nonsense - Answer in a sequence of DNA that results in a premature stop codon
point mutation or substitution - Answer is a genetic mutation where a single nucleotide base is
changed, inserted or deleted from a sequence of DNA or RNA.
alleles - Answer various forms of the same gene
genotype - Answer genetic makeup of a cell
phenotype - Answer An organism's physical appearance, or visible traits.
base analog replacement - Answer are chemicals that mimic bases to such an extent that they can be
incorporated into DNA in place of one of the normal bases but in doing so lead to an increase in the rate
of mutation.
radiation exposure - Answer As radiation strikes the molecules in cells, it creates charged atoms called
ions. Such ionized molecules are highly reactive and can cause mutations in DNA. Because cells are about
80% water, radiation often splits water into hydrogen ions and hydroxyl radicals. Free radicals can
produce mutations if they interact with DNA. Breakage of DNA.
tautomeric shift - Answer The spontaneous isomerization of a nitrogen base to an alternative
hydrogen-bonding form, possibly resulting in a mutation. Reversible shifts of proton position in a
molecule.
, chemical modifications of nucleotides - Answer Chemical mutagens can modify bases in DNA and alter
their base-pairing properties
tetraploidy - Answer containing four homologous sets of chromosomes
trisomy - Answer a condition in which an extra copy of a chromosome is present in the cell nuclei,
causing developmental abnormalities. 47 chromosomes
monosomy - Answer Absence of one chromosome of a pair of homologous chromosomes.
polyploidy - Answer possession of more than two sets of homologous chromosomes.
What is the purpose of DNA sequencing? - Answer To determine the order of nucleotide bases
Which process is used to create DNA sequences that have not naturally occurred in organisms? - Answer
DNA recombination
Which process has one step that involves inserting segments of DNA into plasmid vectors? - Answer
Recombinant DNA
DNA microarray - Answer molecular genetics technique uses thousands of different short sequences of
DNA bonded to a surface to analyze the expression of genes
DNA profiling - Answer technique that allows people to trace their genetic ancestry
sense mutation - Answer mutations that change a stop codon into one that codes for an amino acid
resulting in a longer sequence and elongated proteins
frameshift - Answer the insertion/deletion of extra bases other than in multiples of three in DNA
leading to a shift in the codon reading frame
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