Identify two adaptations in different living organisms and use natural selection to explain how each may have
logically evolved. What will be an ideal response?
Example 1: The long, flexible tongue of a frog is an adaptation for catching insects. In a
population of frogs much genetic variation would exist with respect to tongue length.
However, those frogs having longer tongues would be able to catch more insects than the
short-tongued frogs which might be weak and even starve. Over many generations frogs
having long tongues would most likely thrive and produce more offspring than frogs having
short tongues, and consequently the long-tongue trait would become more and more
prevalent in the population.
Example 2: The thick coat of the polar bear is an adaptation for surviving low temperatures.
In a population of polar bears much genetic variation would exist among coat thickness.
However, those bears having a thinner coat would be more adversely affected by the low
temperatures, for example they might be sickly, be less fertile, and even die. Over many
generations, bears having thicker coats would most likely thrive and produce more offspring
than thin-coated bears, and consequently the thick-coated trait would become more and more
prevalent in the population.
You might also like to view...
Which of the following is NOT a characteristic
of type 2 diabetes?
a. pancreatic islet cells are destroyed b. onset of symptoms typically begins in middle age c. obesity is a big risk factor d. diet and exercise can help control it e. all of these are characteristics of type 2 diabetes
Which of the following is true concerning root
nodules? a. They may kill a plant. b. They are produced by a fungus. c. They remove nitrogen compounds from the plant. d. They convert the harmful ammonia that plant cells produce into gaseous nitrogen. e. None of these are true
Viruses acquire envelopes around their nucleocapsids during
A. adsorption. B. replication. C. penetration. D. release. E. assembly.
Haemophilus capsule polysaccharide plus diphtheria toxoid is a(n)
A) inactivated whole-agent vaccine. B) attenuated whole-agent vaccine. C) conjugated vaccine. D) subunit vaccine. E) toxoid vaccine.