Height Is a Trait That Shows Continuous Variation in Humans

question 1

Multiple Choice

Height is a trait that shows continuous variation in humans.In pea plants,on the other hand,the tall allele is dominant over the short allele and there are no intermediate heights.What is the best explanation for this difference?

• A)The alleles that control height in pea plants are epistatic.
• B)The alleles that control height in pea plants are pleiotropic.
• C)The alleles that control height in humans are pleiotropic.
• D)Height is a polygenic trait in humans.
• E)Height is a polygenic trait in pea plants.

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Definitions:

Ventral Respiratory Group

A cluster of neurons in the brainstem that play a crucial role in controlling voluntary and involuntary breathing.

Intercostal Nerves

The nerves that run between the ribs and are responsible for conveying information to and from the thoracic area of the chest.

Diaphragm

A dome-shaped, muscular partition separating the thoracic cavity from the abdominal cavity, playing a major role in breathing by contracting and expanding the lungs.

Peripheral Chemoreceptors

Sensory receptors located in the carotid bodies and aortic bodies that detect changes in the chemical composition of the blood, mainly the partial pressure of oxygen.