POB ACTUAL TEST PAPER QUESTIONS AND CORRECT ANSWERS FULL SOLUTION VIEW AHEAD

POB ACTUAL TEST PAPER QUESTIONS
AND CORRECT ANSWERS FULL SOLUTION
VIEW AHEAD

●● fitness
Answer: the ability to produce viable offspring
CONDITION DEPENDENT


●● evolution
Answer: a change in allele frequencies in a population over time
four processes:
- Natural selection
- genetic drift
- gene flow
- mutations


●● Natural Selection
Answer: necessities:
- heritable variation
- differential reproductive success
- phenotypic variation is correlated with variation in offspring number

, -decreases genetic variation


Darwin:
- organisms are related by descent from common ancestors
- Natural selection provides an explanation for organismal diversity


●● Directional selection
Answer: - one extreme phenotype is favored
- average/mean shifts
- variation decreases


●● Stabilizing selection
Answer: - average/mean value is favored
- average/mean value stays the same
- variation decreases


example: HbS allele


●● disruptive selection
Answer: - extreme values favored
- selection against intermediates (removes intermediates)