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sammy [17]
3 years ago
10

Malcolm is studying alone in his room late at night when he hears a loud noise downstairs. His heartbeat increases significantly

and his breathing becomes shallow. He wonders if a burglar has entered the house and decides to investigate. Which division of his nervous system was activated?
Biology
1 answer:
olga_2 [115]3 years ago
5 0

Answer:

Sympathetic nervous system

Explanation:

The sympathetic nervous system stimulates the fight-or-flight system which induces secretion of epinephrine and norepinephrine. This lead to an increase in heartbeat and shallow breathing.

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Explanation:

Polygenic inheritance does not follow Mendel's law of dominance. According to Mendel the dominant trait will mask the recessive trait however, this is not always the case. Polygenic inheritance states that traits are controlled by two or more genes and is also dependent on the environment.

Let's take skin color for example. A fair-skinned person will have a child with a dark-skinned person.

Mendelian inheritance would assume that the offspring would either be fair or dark only.

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