Examples of adaptations
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Examples of Adaptations. Section 15.1 Summary – pages 393-403. Structural adaptations arise over time. Some other structural adaptations are subtle. Mimicry is a structural adaptation that enables one species to resemble another species. Section 15.1 Summary – pages 393-403.

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Examples of Adaptations

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Examples of adaptations

Examples of Adaptations


Section 15 1 summary pages 393 403

Section 15.1 Summary – pages 393-403

Structural adaptations arise over time

  • Some other structural adaptations are subtle.

  • Mimicry is a structural adaptation that enables one species to resemble another species.


Section 15 1 summary pages 393 4031

Section 15.1 Summary – pages 393-403

Structural adaptations arise over time

  • In one form of mimicry, a harmless species has adaptations that result in a physical resemblance to a harmful species.

  • Predators that avoid the harmful looking species also avoid the similar-looking harmless species.


Mimicry

Mimicry

  • Monarch ButterflyViceroy Butterfly


Section 15 1 summary pages 393 4032

Section 15.1 Summary – pages 393-403

Structural adaptations arise over time

  • In another form of mimicry, two or more harmful species resemble each other.

  • For example, yellow jacket hornets, honeybees, and many other species of wasps all have harmful stings and similar coloration and behavior.


More mimicry

More mimicry


Section 15 1 summary pages 393 4033

Section 15.1 Summary – pages 393-403

Structural adaptations arise over time

  • Predators may learn quickly to avoid any organism with their general appearance.


Section 15 1 summary pages 393 4034

Section 15.1 Summary – pages 393-403

Structural adaptations arise over time

  • Another subtle adaptation is camouflage, an adaptation that enables species to blend with their surroundings.

  • Because well-camouflaged organisms are not easily found by predators, they survive to reproduce.


Camouflage

Camouflage

  • Flatfish are some of the most underrated camouflagers in the natural world (halibut, flounder, plaices).


Section 15 1 summary pages 393 4035

Section 15.1 Summary – pages 393-403

Physiological adaptations can develop rapidly

  • In general, most structural adaptations develop over millions of years.

  • However, there are some adaptations that evolve much more rapidly.

  • For example, do you know that some of the medicines developed during the twentieth century to fight bacterial diseases are no longer effective?


Section 15 1 summary pages 393 4036

Section 15.1 Summary – pages 393-403

Physiological adaptations can develop rapidly

Non-resistant

bacterium

Antibiotic

Resistant

bacterium

The bacteria in a population vary in their ability to resist antibiotics.

When the population is exposed to an antibiotic, only the resistant bacteria survive.

The resistant bacteria live and produce more resistant bacteria.


Section 15 1 summary pages 393 4037

Section 15.1 Summary – pages 393-403

Physiological adaptations can develop rapidly

Non-resistant

bacterium

Antibiotic

Resistant

bacterium

  • Today, penicillin no longer affects as many species of bacteria because some species have evolved physiological adaptations to prevent being killed by penicillin.


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