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Transcript of L7: Variations
What are variations?
Variations are differences
(organisms in the same species).
Environmental variations are caused
by things in the environment:
- exercise / lifestyle
- climate (hot / cold)
Weight can increase or decrease based on a person's diet and exercise.
Diet can cause variations in the body, for example the color of these flamingos. If they eat more shrimp, they get more pink color in their feathers. When they digest a chemical in the shrimp it changes their color.
Genetic variations are determined
by the genes passed on from
parents to their kids.
(textbook 3, page 60)
Diet / Chemicals
Example of Genetic Variation:
1. free earlobes
2. attached earlobes
Continuous variations have a
range of how features change,
NOT only a few possible.
Look at some examples below...
In a grade 7 class of girls, height usually ranges from 130cm - 170 cm.
Girls could be 135cm, 142cm, 166cm, etc.
They could be any height in that range.
Weight can be over a big range of numbers.
Miss Audrey is...
Other women my height could be...
The weight for a given height can have a big range for the kilograms.
Example 60 to 90 kg.
Discontinuous variations are variations that have only a few (2 or 3 or 4) possible options for a feature, NOT a big range of options.
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