THE VARIETY OF LIVING ORGANISMS

Organism Variation – Remember it! & Test it!

Organism Variation – Remember it! & Test it!

REMEMBER IT!

  • Random sampling eliminates systematic bias in a sample.
  • The average of the data can be calculated by finding the mean.
  • Variation within a sample can be calculated by finding the normal distribution of the mean and the standard deviation.
  • Causes of variation can be genetic, environmental or both.
  • Genetic variation is usually a product of sexual reproduction.
  • Environmental factors include diet, lifestyle, access to energy sources, and accidents.

——————————————————

TEST IT!

1.

Variation can be due to genetic factors.

a) What is variation?

b) Name another reason for variation in a species and provide two examples.

i. _______________________________________________
ii. ______________________________________________

2.

A class carries out an experiment using frogs in a pond. They take a random sample of the frogs.
a) What’s important about taking a random sample?
b) Name two ways in which they could analyse the data they collect.
i. ___________________________________________________
ii. ___________________________________________________

ANSWERS

1.

a) Differences between organisms
b) Environmental factors.
Examples include:

i. diet
ii. lifestyle
iii. accidents
iv. access to energy sources

2.

a) It prevents systematic bias

b) Answers include:

i. mean
ii. normal distribution of the mean
iii. standard deviation