18.2 - Variation in Phenotype Flashcards
The causes of variation
1
Q
What is variation?
A
Differences among individuals in a population
2
Q
What are the two main causes of variation?
A
- Genetic factors
- Environmental factors
3
Q
What is genetic variation?
A
Variation due to genes and alleles
4
Q
What are sources of genetic variation?
A
Mutations
5
Q
What is environmental variation?
A
Variation caused by environment
6
Q
What environmental factors cause variation?
A
Light
7
Q
How do environmental factors affect genes?
A
Influence gene expression
8
Q
What is the combined effect of genetic and environmental factors?
A
Genetic makeup sets potential
9
Q
What are polygenes?
A
Different genes at different loci contributing to phenotype
10
Q
What is the effect of polygenes?
A
Combined effect produces observable variation
