1. In your own words, define natural selection. Use the words species and variation in your answer.

Transcription

1 Warm-Up 1. In your own words, define natural selection. Use the words species and variation in your answer. Natural Selection is 2. Do species change after many generations or during individual lifetimes? Why? Species change...

2 Natural Selection and Adaptations Unit 9 Natural Selection traits that make an organism have more babies are more likely to be passed on to the next generation. Reproductive Fitness is the ability to reproduce.

3 Natural Selection and Adaptations Sexual Selection is a type of natural selection (reproductive fitness). Some animals have gained traits to help their chances of being able to reproduce. Survival of the Fittest

4 Natural Selection and Adaptations Examples include: Male-widow birds Males with longer tails are sought after by females!

5 Turn and Talk Why is reproductive fitness more powerful than physical fitness? If one individual has 6 kids and 12 grandkids and another individual has 3 kids and 15 grandkids, which individual is more reproductively fit? How do you know?

6 Quick Activity 1. Male elephant seals have powerful, inflatable, snouts. They can use this snout to amplify snorts, grunts, as well as a way to apply force. 2. Male great frigate birds have a red gular sac on their chest that they used to attract females. Describe how this snout adaptation in male elephant seals helps males increase their reproductive success. The snout adaptation in male elephant seals helps increase their reproductive success because Describe the probability that a male great frigate bird with a pink, and small gular sac would be able to reproduce in comparison to a male with a bright red, and large gular sac. The probability of a male great frigate bird with a pink, and small gular sac reproducing in comparison to a male with a bright red, and large gular sac is.

7 Quick Activity 3. Male rams have powerful horns that they use to help fight against other males. 4. Male birds of paradise display bright, yellow, plumage that they use to attract females who are ready to mate. Describe how male rams who have cracked horns decrease their chances of reproductive success. A male ram with cracked horns decreases their chances of reproductive success because Describe how a male bird of paradise with bright, yellow, plumage has a higher chance of reproductive success than a male with dull, orange plumage. A male bird of paradise with bright, yellow, plumage has a higher chance of reproductive success rather than a male with dull, orange, plumage because...

8 Natural Selection and Adaptations Unit 9 Natural Selection Survival of the Fittest Charles Darwin came up with the original idea, 1859.

9 Natural Selection and Adaptations Natural Selection only works if you have genetic variation. Unit 9 Peppered moth Minute physics video % % Industrial Revolution Pre-Industrial Revolution Post-Industrial Revolution Variation!

10 Variation! Natural Selection and Adaptations Natural Selection only works if you have genetic variation. Genetic Variation - differences in DNA Unit 9

11 Percent of Population Natural Selection and Adaptations Natural Selection only works if you have genetic variation. Genetic Variation - differences in DNA Unit 9 100% 50% Variations! 0% Time (generations)

12 Natural Selection and Adaptations Certain genetic variations have an advantage or a disadvantage for a species.

13 Natural Selection and Adaptations Certain genetic variations have an advantage or a disadvantage for a species. Camouflage allows this gecko to hide from predators & to catch prey off guard

14 Percent of Population Natural Selection and Adaptations Unit 9 When one variation is in ALL of the population, it is called an adaptation. 100% ALL orange beetles 50% adaptation No more green beetles 0% Time (generations)

15 Natural Selection and Adaptations Unit 9 The dinosaurs didn t (all) die, they just evolved adaptations to fly, becoming birds.

16 Think Predict what happens to a variation that does not become an adaptation?

17 Turn and Talk What is the difference between an adaptation and a variation?

18 adaptation population Reproductive fitness selective advantage

19 Natural Selection and Adaptations Describe an adaptation for each of the species which it evolved from its common ancestor. Horse Tapir Rhinoceros Common Ancestor: Eohippus

20 Natural Selection and Adaptations Describe an adaptation for each of the species which it evolved from its common ancestor. Puffer Fish Parrot Fish Lion Fish Common Ancestor: Andreolepis hedei

21 Closure Explain how selective advantages lead to adaptations. Selective advantages lead to adaptations because