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A mutation that causes a mutant phenotype only under restrictive conditions
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An allele that reverses the effect of a mutation of another gene, resulting in a wild-type phenotype is a(n)
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An individual cell homozygous for a mutant allele of the gene for a human enzyme contains no detectable activity for that enzyme. The mutation is best described as
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A researcher studying hemoglobin predicts that a histidine within the protein is important for binding oxygen. She used site-directed mutagenesis to change a codon for histidine (CAU) to one for lysine (AAA). However, the mutant hemoglobin still binds oxygen just as well as the wild-type and has no other apparent changes. This type of mutation is called
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A mutant allele of corn leads to absence of red anthocyanin pigment in the kernel (absence of anthocyanin results in a yellow color). The allele, however, is unstable, reverting quite late, yet often, in development. The expected phenotype of kernels
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A missense mutation in Neurospora will revert by treatment with nitrous acid (causes transversions), but not by hydroxylamine (causes AT -> GC transitions). The original mutation (not the reversion) must have been
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