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Kruka [31]
3 years ago
10

The bottleneck effect is used to describe an event where a population decreases. One example involves the northern elephant seal

. They have a reduced genetic variation due to a population bottleneck humans inflicted on them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century. Their population has since rebounded to over 30,000, but they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted. Which phrase best explains this change if gene frequency?
Biology
2 answers:
kkurt [141]3 years ago
6 0
Genetic drift  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Svet_ta [14]3 years ago
5 0
I think the best phrase to describe this would be Founder effects. Founder effects occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have; a non-random sample of genes in the original population. Reduced variation from the original population.. According to Bottlenecks and founder effects, genetic drift can cause big losses of genetic variation for small populations.
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have curved protofilaments at their plus ends

Explanation:

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2 years ago
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Answer:

The correct answer is option Complex neuroendocrine response.

Explanation:

Hypothalamus is the thermostat of the body as it regulates and maintains body temperature by responding to external signals or stimuli and adjusts the body temperature in a close one to two degree of 98.6 degree.

The regulation involves a different type of endocrine hormones and thyroid gland and receptors that help in signaling the increase or decrease of body temperature it involves neurons and hormones.

Due to the response of thermoreceptors and hormones is known as the neuroendocrine response. Hypothalamus Involves two or more hormones and several steps it known as a complex response.

Thus, the correct answer is a Complex neuroendocrine response.

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