Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:14.25) Mutations can be classified as small-scale or large-scale, depending on the number of nucleotides involved in the
mutation. Small-scale mutations involve a change in a small number of nucleotides (usually one to three nucleotides)
within a single gene. Large-scale mutations, sometimes called chromosomal mutations, involve changes in large sections
of chromosomes.
Determine whether each of the following small-scale mutations is a point mutation, insertion mutation, or
deletion mutation.
a) The sequence of nucleotides in part of a gene is changed from CCGATG to CCGGATG. insertion mutation
b) The sequence of nucleotides in part of a gene is changed from CCGATG to CCGAGG. point mutation
c) The sequence of nucleotides in part of a gene is changed from CCGGAG to CTGGAG. point mutation
d) The sequence of nucleotides in part of a gene is changed from CCGATG to CCGACTG. insertion mutation
e) The sequence of nucleotides in part of a gene is changed from CCAGATG to CCGATG. deletion mutation
EXPLANATION: Small-Scale Mutations
Point mutation: A single, incorrect nucleotide takes the place of the original nucleotide.
Insertion mutation: One or more extra nucleotides are inserted between two of the original nucleotides in a gene.
Deletion mutation: A single nucleotide or a short sequence (usually 2 or 3 nucleotides) are removed from a gene.
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