Polydactyly Is the Condition of Having Extra Fingers or Toes

question 35

Multiple Choice

Polydactyly is the condition of having extra fingers or toes. Some polydactylous persons possess extra fingers or toes that are fully functional, whereas others possess only a small tag of extra skin. This is an example of:

• A) variable expressivity.
• B) complete dominance.
• C) independent assortment.
• D) complementation.
• E) cytoplasmic inheritance.

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Definitions:

Sporophyte Generation

The 2n, spore-producing stage in the life cycle of a plant. Compare with gametophyte generation.

Liverworts

A phylum of spore-producing, nonvascular, thallose or leafy plants with a life cycle similar to that of mosses.

Club Mosses

A phylum of seedless vascular plants with a life cycle similar to that of ferns.

Horsetails

Fern relatives with hollow, jointed stems, to which tiny leaves (reduced megaphylls) are attached in whorls.