HEREDITY
MUTATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A single N-base is changed.
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A single N-base is added.
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Part of a chromosomes is flipped/backwards.
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Part of a chromosome break off and attaches to a new location.
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Detailed explanation-1: -An inversion occurs when a chromosome breaks in two places; the resulting piece of DNA is reversed and re-inserted into the chromosome. Genetic material may or may not be lost as a result of the chromosome breaks.
Detailed explanation-2: -Definition. An inversion in a chromosome occurs when a segment breaks off and reattaches within the same chromosome, but in reverse orientation. DNA may or may not be lost in the process.
Detailed explanation-3: -Inversion events can produce hybrid genes that have varying portions of two genes, not necessarily half and half. However, inversion events can connect half of a gene with a region of DNA that has no genes. The result would be a broken gene.
Detailed explanation-4: -Pericentric inversions are most frequent, often reported for chromosomes 1, 2, 3, 5, 9, 10 and 16. These are some of the most common cytogenetically visible rearrangements in humans-for example, the pericentric inversion of chromosome 9 is found in over 1% of karyotypes [17].