Section 19.5 (Exam 3) Flashcards
Selection Can Maintain Variation within and among Populations
1
Q
Define frequency-dependent selection.
A
Polymorphism can be maintained when fitness depends on its frequency in the population, allowing more rare phenotypes to persist.
2
Q
Define heterozygote advantage.
A
In changing conditions, heterozygous individuals are likely to outperform homozygotes
3
Q
How is genetic variation maintained in populations in different geographic regions?
A
they may be subjected to different environmental conditions and selective pressures
4
Q
Define clinal variation.
A
Gradual change in phenotype across a geographical area
