recall: a species is a group of living organisms with similar features members of the same species...

VARIATION Monday, June 13, 2011 – Lesson 4 Outcomes: Level E: I can identify what variation is Level D: I can describe how variation occurs in living organisms Level C: I can explain how variation occurs and why it is important for species Aim: How does variation occur in species?

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List 5 characteristics of dogs that are similar. List 5 characteristics that are different.

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Page 1: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

VARIATIONMonday, June 13, 2011 – Lesson 4

Outcomes:Level E: I can identify what variation is

Level D: I can describe how variation occurs in living organisms

Level C: I can explain how variation occurs and why it is important for species

Aim:How does variation occur in species?

Species

• Recall: a species is a group of living organisms with similar features

• Members of the same species can breed together

• Example: All dogs are members of the same species by they don’t all look the same

• List 5 characteristics of dogs that are similar.• List 5 characteristics that are different.

Page 4: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

Variation• Differences between members of the same

species are called variation

• Can I get 10 volunteers... 2 from each table

• How many different ways could you classify these 10 people?

Page 5: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

What Causes Variation

• Variation is cause by either environmental factors or inherited factors

This type of variation is passed on in genes from parent to offspring

This type of variation is influenced by living conditions and surroundings

Page 6: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

• What are some of the inherited characteristics of humans?– Eye colour, hair colour, height, blood type

• Any other inherited characteristics?

Page 7: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

• Environmental variation is cause by differences in living conditions and surroundings

• What do you think causes environmental variation?– Food supply, temperature, water supply, humidity,

disease• How would these affect variation?– Influence the way you look, speak, and how you

do things

Page 8: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

• Some inherited characteristics can be affected by environmental factors

Page 9: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

Which are inherited, environmental or both?Inherited Environmental Both

Blood Group

Wears glasses

Tongue Rolling

Freckles

Speaks Italian

Dyed Pink Hair

Neutral Eye Colour

Height

Welsh Accent

Page 10: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

Continuous vs. Discontinuous Variation

Page 11: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

Examples of Variation in Humans

• Discontinuous: Blood Type, hair colour

• Continuous: Height, eye colour

Page 12: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

What about plants?

• Plants and organisms from other kingdoms are also affected by inherited and environmental factors

Page 13: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

Plenary: True or False

1. Members of the same species all look the same

FALSE!

Members of the same species have similar features but do not look the same

Page 14: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

2. Only living things that are members of the same species can breed together to produce fertile offspring

TRUE!Some species can be interbred – but their

offspring are infertile

Page 15: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

3. Variation only occurs in animals

FALSE!Variation occurs in all living things, including

plants and bacteria

Page 16: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

4. Variation caused by environmental factors can be passed from parent to offspring

FALSE!

Only inherited characteristics are passed from parent to offspring

Page 17: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

5. Identical twins are more alike than most but even they are not exactly the same

TRUE!Identical twins inherit the same features but

they have different fingerprints

Page 18: Recall: a species is a group of living organisms with similar features Members of the same species can breed together Example: All dogs are members of

6. The ability to roll your tongue is an inherited characteristic.

TRUE!

Have you inherited this type of variation?

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