U1M2L2 Theory of Natural Selection & Adaptations PT1

​U1M2L2

Theory of Natural Selection & Adaptations

Alef Lessons 16 - 19​

​Time for you to show what you have learnt from the previous lesson

​DO NOW: How Traits Change?

Match

Match the following definitions to the correct meaning

• a characteristic of an organism

• a molecule made of a nitrogen base, a sugar, and a phosphate group

• a permanent change in the sequence of DNA, or the nucleotides, in a gene or a chromosome

• ribonucleic acid, a chemical that carries the code for making proteins

• a segment of DNA

Trait

Nucleotide

Mutation

RNA

Gene

• Trait

• Nucleotide

• Mutation

• RNA

• Gene

​Lesson Objectives

• Explore how similar variations in a population due to inherited mutations can cause an adaptation over generations

• Learn about Darwin's Theory of Natural Selection

• Analyse how a species' interactions with its environment can lead to suppression of others through natural selection.

• Construct explanations to demonstrate their understanding of how populations of organisms change over time.

​Vocabulary

• Natural Selection - a process by which organisms with favorable traits tend to survive and reproduce

• ​Adaptations - an inherited trait that helps organisms survive and reproduce in an environment

• ​Variation -a slight difference in an inherited trait among individual members of the same species

• ​Camouflage - an adaptation that enables a species to blend with its environment

• ​Mimicry - an adaptation in which on species looks like another species

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​Notice & Wonder

• ​Alef ​Lesson 16

• We do together!​

• Groupwork - work with your shoulder partner to complete the Exit Ticket

Poll

How are feeling about the lesson so far?

• Excellent

• I have a good understanding so far

• Doing good ....... but I will need practice more

• I need to practice more

​LEARN

• ​Alef lesson 17

• Work in groups to complete this lesson​

I will be discussing the topic with you.​

Please pay close attention as you will be asked questions at anytime​

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WE DO

ALEF LESSON 17​

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​Theory of Natural Selection and Adaptations

Variation in Traits​

REMEMBER: Traits are physical fact about organisms

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Traits come from instruction in our Genes

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Mutations in Genes make variations in traits​

​Theory of Natural Selection and Adaptations

Example 1 : Eye Colour​

Example 2: Fur Pattern Variations​

​Theory of Natural Selection and Adaptations

• Albinism is when an organism has no colour in its skin or hair

• It is ca​used by a mutation to the genes for skin and hair colour

• Melanism is when an organism has only black colour in its skin or hair

• It is caused by a mutation to the genes for skin and hair colour​

​Mutation and Variations

1. Mutations can be helpful because it will help the organism hide from predators​

2. Can make survival more difficult

3. Neutral does not help or harm the organism​

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​Mutation and Variations

Helpful mutations: Fur colour of a rabbit

The white fur makes it easy for the rabbit to hide in snow​

Harmful mutations: The type of food the giraffe eat makes it possible for the those with long necks to survive​

​Mutation and Variations

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Adaption is a mutation that helps an animal to survive

Giraffes have adapted longer necks making it easier to find food high up in trees​

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​Mutations VS Inherited Traits

An adaptation is when a mutation becomes an inherited trait

Over time Giraffes have adapted longer necks to ensure survival ​

​Camouflage as an adaption

Let's watch this video so we can learn more​

Camouflage is an adaptation

This is when an animal changes how it looks to match the environment

Multiple Choice

Which one is an example of a harmful mutation?

Multiple Select

Which TWO are examples of a useful mutation?

Multiple Choice

The fur of the snowshoe rabbit changes to a lighter color in the winter. This allows the rabbit to blend in with its surroundings. This change is an example of:

• Adaptation

• Extinction

• Competition

• Succession

Multiple Choice

Due to genetic inheritance, members of a species can be slightly different from another in their traits. This is known as...

• Variation

• Overproduction

• Competition

• Evolution

Multiple Choice

An Adaptation is...

• a change or process in a species that helps it become bigger or smaller.

• a change or process that causes no change in a species.

• a change or the process of change by which an organism or species becomes better suited to its environment.

• a change or the process of change by which an organism or species is not able to adapt and survive.

Designed the theory of Natural Selection

He was scientist that studied plants and animal​

He discovered that the bird on Gala​pagos island had different beaks

Charles Darwin

Multiple Choice

Which bird is better ADAPTED to eat large nuts and seeds?

• 1

• 2

• 3

• 4

Multiple Choice

Which bird is better ADAPTED to eat bugs hiding in nooks and crannies in trees?

• 1

• 2

• 3

• 4

Multiple Choice

Charles Darwin’s observation that finches of different species on the Galápagos Islands have many similar physical characteristics supports the hypothesis that these finches 
 

• have the ability to interbreed.
  have the ability to interbreed.
• acquired traits through use and disuse.
• all eat the same type of food.
• descended from a common ancestor.

Multiple Choice

Where the better adapted organisms survive to pass traits along to offspring.

• Evolution
• Natural Selection
• Extinction
• Artifical Selection

Work in groups to complete the lesson

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YOU DO

ALEF LESSON 17​

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Video Response

SHARE YOUR THOUGHTS

Open your camera

Now make a short recording about what you have learnt from today's lesson.

(This video is only for us in class, NO ONE else will see it!)

Open Video Recorder