BIOS 242 WEEK 9 FINAL EXAM EXAMS SET 2026 COMPLETE QUESTIONS ANSWERS GRADED A+

BIOS 242 WEEK 9 FINAL EXAM EXAMS SET
2026 COMPLETE QUESTIONS ANSWERS
GRADED A+

◉ Natural selection. Answer: Process where individuals with
heritable traits that increase fitness leave more offspring


◉ Fitness. Answer: Reproductive success; how many viable offspring
an individual leaves


◉ Mutation. Answer: Random change in DNA; ultimate source of
new genetic variation


◉ Variation. Answer: Differences in traits among individuals in a
population


◉ Heritability. Answer: Ability of a trait to be passed from parents to
offspring


◉ Directional. Answer: selection Selection that favors one extreme
trait value, shifting the population mean

, ◉ Stabilizing. Answer: selection Selection that favors intermediate
trait values and removes extremes


◉ Disruptive. Answer: selection Selection that favors both extreme
trait values over intermediates


◉ Sexual selection. Answer: Selection for traits that increase mating
success rather than survival


◉ Genetic drift. Answer: Random changes in allele frequencies,
strongest in small populations


◉ Bottleneck effect. Answer: Loss of genetic variation after a sudden
population reduction


◉ Founder effect. Answer: Genetic drift when a small group starts a
new population


◉ Gene flow. Answer: Movement of alleles between populations via
migration


◉ Speciation. Answer: Evolution of reproductive isolation between
populations