Answer:
A person can have normal chromosomes in number and structure, but still have a disease or condition caused by a mutation in one or more of the genes on the chromosomes. A single gene defect usually does not cause the chromosome structure or number to be abnormal.
Explanation:
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<span>pan stairs made by filling concrete after they are installed or have been set in place.Pan stairs typically have treads that are flanged up in the front and back to receive a cement fill. They are are affordable type of stairways and these stairs are intended for use in conjunction with our Concrete Filled Landings.</span>
