Height and Eye Colors Are Two Examples of Continuous Variation

question 14

Multiple Choice

Height and eye colors are two examples of continuous variation in humans.Whereas in pea plants the tall allele is dominant over the short allele,there are no intermediate heights in peas.Which of the following is the best explanation for the differences described above?

• A)Humans are more advanced than pea plants;thus,the genetics of peas is much simpler than humans.
• B)The intermediate size pea plant seeds are aborted within the seedpod and thus will never develop.
• C)The intermediate size pea plant seeds have deleterious alleles that prevent them from germinating.
• D)Many genes,rather than one gene for a characteristic,control some variations in species.
• E)These variations in humans are affected by lack of dominance in the alleles that control these traits.

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Definitions:

Potassium

A chemical element with symbol K and atomic number 19, vital for nerve function, muscle contraction, and maintaining fluid balance in the body.

Acromegaly

A hormonal disorder that develops when the pituitary gland produces too much growth hormone, leading to enlarged bones in hands, feet, and face.

Enlargement

The process of making something larger or more extensive.

Oxytocin

A hormone produced by the hypothalamus and secreted by the pituitary gland, promoting bonding, social behaviors, and is also involved in childbirth and lactation.