The Northern Elephant Seal Was Hunted Almost to Extinction During

question 41

Multiple Choice

The northern elephant seal was hunted almost to extinction during the 18^th and 19^th centuries.Less than 100 seals were left to contribute to the gene pool of their future generations.Since the early 20^th century,the elephant seals have been protected by law in both the U.S.and Mexico.Over 100,000 seals now inhabit the western shores of North America,all related to the small population that survived the slaughter of hunters. Scientists fear the elephant seals may be more susceptible to disease and pollution due to a ______.

• A)a heterozygous advantage
• B)disruptive selection
• C)Founder Effect
• D)Bottleneck Effect

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Definitions:

Genes

Basic units of heredity that are passed down from parents to offspring, containing DNA that determines characteristics and traits.

Endocrine System

A network of glands and organs in the body that produces, stores, and releases hormones to regulate various bodily functions and maintain homeostasis.

Adrenal Glands

Small, triangular glands located on top of both kidneys that produce a variety of hormones, including adrenaline and cortisol, which regulate metabolism, immune response, and stress responses.

Gonads

The primary reproductive organs in animals, specifically the testes in males and ovaries in females, responsible for producing gametes and sex hormones.