THE MOLECULAR BASIS OF INHERITANCE
GENE MUTATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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at most two amino acids would be changed.
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at most, only one amino acid would be changed.
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all the amino acids would be changed.
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Detailed explanation-1: -What would be the result if a gene sequence was changed from ACCGAT to ACGGAT? at most two amino acids would be changed.
Detailed explanation-2: -A mutation is a change in the DNA sequence of a gene. Though some mutations are harmful, most are not. A mutation may change a trait in a way that may even be helpful, such as enabling an organism to better adapt to its environment.
Detailed explanation-3: -Harmful mutations may cause genetic disorders or cancer. A genetic disorder is a disease caused by a mutation in one or a few genes. A human example is cystic fibrosis. A mutation in a single gene causes the body to produce thick, sticky mucus that clogs the lungs and blocks ducts in digestive organs.
Detailed explanation-4: -What may happen when a mutation changes the amino acid sequence of a protein? Messenger RNA may no longer be transcribed because codons change: The protein may become less effective, more effective, or altogether nonfunctional Messenger RNA may identify altered proteins and remove them from the cell.
Detailed explanation-5: -Mutations in a gene can result in a change in the sequence of amino acids such as in frameshift mutations and in missense and nonsense mutations occurring in point mutations. However, point mutations can also lead to silent mutations.