2025/2026 Exam Questions and Answers
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What are the key features of natural selection? - 🧠 ANSWER ✔✔genetic
variation
over production of offspring
struggle for existence
Acquired vs. Inherited traits - 🧠 ANSWER ✔✔Acquired- changes made to
body that don't affect DNA
Inherited- traits derived from DNA
What was Darwin's and Wallace's contribution to science? - 🧠 ANSWER
✔✔mechanism for which evolution occurs, evolution with natural selection
,What is the role that populations play in natural selection and evolution? - 🧠
ANSWER ✔✔natural selection and evolution occur at the population level
What is Hardy Weinburg equilibrium? - 🧠 ANSWER ✔✔p^2 + 2pq+ q^2 =1
-If a population is at equilibrium, (percentages don't change)
-No genetic drift, gene flow, no natural selection, no new alleles, no sexual
selection
-Genetic drift, gene flow, and natural selection cause most evolutionary
change
Genetic Drift - 🧠 ANSWER ✔✔Chance events cause the allele frequency of
a small population to fluctuate unpredictably
-Founder Effect, small sub population goes somewhere else
-Bottleneck Effect, natural disaster, sudden change in environment
Gene Flow - 🧠 ANSWER ✔✔The addition or subtraction of alleles due to
the movement of reproductively viable individuals
Natural Selection - 🧠 ANSWER ✔✔Alleles that enhance survival and
reproduction increase over time
, Biological Species Concept - 🧠 ANSWER ✔✔-if it can breed and produce
offspring then it's the same species
-No gene flow
Morphological Species Concept - 🧠 ANSWER ✔✔Morphology, body shape,
structural features
-gene flow is unknown
Ecological Species Concept - 🧠 ANSWER ✔✔Defines species based on
"ecological niche"
Two species may maintain different ecological niches and/or behavior,
and/or morphology yet occasionally interbreed (gene flow)
Pre zygotic barriers - 🧠 ANSWER ✔✔-no zygote is formed
-temporal isolation
-mechanical isolation
-gametic isolation
Post zygotic barriers - 🧠 ANSWER ✔✔-Zygote is formed
-Hybrid Breakdown
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