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18 Variation and
Selection
18.1 Causes and types of variation
ppt 1
We belong to the same species; Homo sapiens.
We share many similar features, but we are not exactly the same.
Differences between individuals of the same species is called
variation.
Variation
Terminology
• Phenotype = the observable features of an
organism
• Genotype = the genetic make-up of an organisms
Which features are caused by the gene’s the person has (inherited),
and which ones are caused by the environment (acquired)?
Or
Genotype + Environment = Phenotype
Limited number of phenotypes with no intermediates. Usually caused by
genes alone (genotype).
Range of phenotypes between two extremes. Usually caused by both
genetic and environmental factors
Class work…
• Access the Google sheet
https://docs.google.com/spreadsheets/d/1s5rHLzWn6z
nk-rgg2QhEJlcY-z5eTytdREnDhLDNs6I/edit?usp=sharing
• Record class data on;
Height
Index finger length
Shoe size
Attached or free ear lobes
Widows peak
Ability to roll tongue
• Use the data to draw one bar chart, one pie chart and
one histogram.
height category / cm tally frequency
140 – 144
145 – 149
150 – 154
155 – 159
160 – 164
165 – 169
170 – 174
175 – 179
Investigating Continuous Variation
• Place the heights of students in your class in the tally chart below.
• Work out the frequency of each category.
• Draw a histogram to display your results.
1 What is the modal (most common) height of people in your class?
2 Height is an example of what sort of variation?
3 What causes this sort of variation?
Homework…
• Read textbook pages 232/233
• Read through and complete booklet pages 3/4.

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18.1 01 Variation 2020-22.pptx

  • 1. 18 Variation and Selection 18.1 Causes and types of variation ppt 1
  • 2. We belong to the same species; Homo sapiens. We share many similar features, but we are not exactly the same. Differences between individuals of the same species is called variation. Variation
  • 3. Terminology • Phenotype = the observable features of an organism • Genotype = the genetic make-up of an organisms
  • 4.
  • 5. Which features are caused by the gene’s the person has (inherited), and which ones are caused by the environment (acquired)?
  • 7.
  • 8.
  • 9.
  • 10. Limited number of phenotypes with no intermediates. Usually caused by genes alone (genotype).
  • 11.
  • 12.
  • 13. Range of phenotypes between two extremes. Usually caused by both genetic and environmental factors
  • 14.
  • 15. Class work… • Access the Google sheet https://docs.google.com/spreadsheets/d/1s5rHLzWn6z nk-rgg2QhEJlcY-z5eTytdREnDhLDNs6I/edit?usp=sharing • Record class data on; Height Index finger length Shoe size Attached or free ear lobes Widows peak Ability to roll tongue • Use the data to draw one bar chart, one pie chart and one histogram.
  • 16. height category / cm tally frequency 140 – 144 145 – 149 150 – 154 155 – 159 160 – 164 165 – 169 170 – 174 175 – 179 Investigating Continuous Variation • Place the heights of students in your class in the tally chart below. • Work out the frequency of each category. • Draw a histogram to display your results. 1 What is the modal (most common) height of people in your class? 2 Height is an example of what sort of variation? 3 What causes this sort of variation?
  • 17. Homework… • Read textbook pages 232/233 • Read through and complete booklet pages 3/4.