Joseph and Kenneth Are Twins Resulting from Two Ova

question 61

Multiple Choice

Joseph and Kenneth are twins resulting from two ova.What proportion of their genes do the boys have in common?

• A)precisely 50 percent 
• B)about 50 percent
• C)about 25 percent
• D)100 percent

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Definitions:

Accommodation

The ability of the eye to change its focus from distant to near objects (and vice versa) by changing the curvature of the lens.

Suspensory Ligaments

Fibrous tissues that support an organ or structure, for example, holding the lens of the eye in place.

Spherical

Having the shape or form of a sphere, meaning it is perfectly round in all directions.

Optic Disc

The point on the retina at which the optic nerve fibers exit the eye, creating the blind spot as it lacks photoreceptors.