In the nematode C.elegans,homozygosity for the "e" mutant allele causes an extreme "uncoordinated" phenotype,where the worm completely loses its ability to move.Examination of 100 individuals with genotype e/e reveals that 58 of them can't move at all,45 show a very reduced ability to move,and the remaining 17 seem to have a completely wild-type phenotype with respect to movement ability.These observations suggest that e has:

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The fact that not all individuals with the e/e genotype exhibit the extreme uncoordinated phenotype suggests incomplete penetrance. The variable expressivity is evident in the fact that some individuals have a completely wild-type phenotype while others have a very reduced ability to move or can't move at all. The environmental component cannot be determined from the given information, and there is no evidence of low expressivity or low penetrance.

In the Nematode C