The effect of a mutation in a gene results in an animal that cannot make a protein that allows muscles to contract is that the animal will die before having any offspring.
Mutation is any change in the nucleotide sequence of the DNA.
Since genes are responsible for the synthesis of proteins, this means that a change in the nucleotide sequence of the gene will affect the production of proteins.
According to this question, a mutation in a gene results in an animal that cannot make a protein that allows muscles to contract.
This means that the animal will die before it gets the chance to produce offsprings.
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