Biology
Grade-8
Easy
Question
A recessive mutation is one which
- Is not expressed
- Is expressed only when heterozygous
- Is expressed only when homozygous
- Is eliminated by natural selection
Hint:
In recessive mutation, both alleles must be mutant in order for the mutant phenotype to be observed and expressed only in homozygous conditions.
The correct answer is: Is expressed only when homozygous
- Loss of function mutations is typically recessive.
- When a heterozygote consists of the wild-type allele and the loss-of-function allele, the level of expression of the wild-type allele is often sufficient to produce the wild-type phenotype.
- Genetically this would define the loss-of-function mutation as recessive.
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