In the Nematode C

question 46

Multiple Choice

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:

• A)high environmental components.
• B)incomplete expressivity.
• C)incomplete penetrance and variable expressivity.
• D)low expressivity and variable penetrance.
• E)low penetrance.

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