One of Two Major Forms of a Human Condition Called

question 62

Multiple Choice

One of two major forms of a human condition called neurofibromatosis (NF 1) is inherited as a dominant gene, although it may range from mildly to very severely expressed. If a young child is the first in her family to be diagnosed, which of the following is the best explanation?

• A) The mother carries the gene but does not express it at all.
• B) One of the parents has very mild expression of the gene.
• C) The condition skipped a generation in the family.
• D) The child has a different allele of the gene than the parents.

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Definitions:

Compact Bone

The compact, rigid external layer of bone that offers support and form.

Tubular

Describes something that is long, hollow, and cylindrical, often used in reference to certain structures or shapes in biology and manufacturing.

Compact Bone

The dense, hard outer layer of bone that gives it strength and houses osteocytes in a rigid framework.

Medullary Cavity

The central cavity within the shaft of long bones where bone marrow is stored.