Evoultionan Variatio Flashcards
(9 cards)
What is variation ?
Differences in the characteristics of individuals in a population
What are the two types of variation ?
Genetic variation
Environmental variation
What causes genetic variation ?
Different genes
From combing the mother and father gametes
Give an example of genetic variation ?
Eyecolour
Shape of nose
Give an example of environmental variation
Skin colour
Losing toes
What are mutations?
Changes to the sequence of bases in DNA
Explain what is meant by environmental variation
Differences between members of the same species that have been caused by the conditions something lives in
What have all today’s species evolved from ?
Simple life forms that first started to develop over 3 billion years ago
Give three factors that can lead to a species becoming extinct ?
- changes in the environment
- catastrophic event
- diseases
- new predators
- changes in the environment
