Evolution
How do populations, rather than individuals, evolve over time?
Focuses on allele frequencies, genetic variation, and the gene pool.
Why must a hypothesis be testable and falsifiable to be scientifically valid?
It must have a clear way to be proven wrong through observation or experimentation.
Why can natural selection only act on traits that are heritable?
Non-heritable traits cannot be passed to future generations, so they cannot change a population's genetic makeup.
What is the difference between qualitative and quantitative observations?
Qualitative observations describe qualities using words, while quantitative observations measure quantities using numbers.
What is evolution?
Evolution is the process by which the genetic makeup of a population changes over successive generations.
What is the difference between natural selection and genetic drift?
Explores the difference between adaptive survival and random chance events in small populations
What role does the independent variable play compared to the dependent variable?
The independent variable is manipulated, while the dependent variable is measured for changes.
How does geographic isolation lead to the formation of a new species?
Separated populations adapt to different environments and accumulate distinct genetic mutations until they can no longer interbreed.
Why do scientists write a conclusion if their data refutes their original hypothesis?
Negative results still provide valuable data and help scientists refine or create new hypotheses.
Is evolution just a guess or a theory?
It is a well-substantiated explanation of some aspect of the natural world.
Why are structural similarities between entirely different species (like bat wings and human hands) important?
Focuses on homologous structures and common ancestry.
How does a control group help isolate the effects of the experimental variable?
It provides a baseline by keeping all conditions identical except for the tested variable.
What is convergent evolution, and what causes it?
It is when unrelated species develop similar traits because they adapt to similar environmental pressures.
How do double-blind studies eliminate bias in scientific experiments?
Neither the subjects nor the researchers know who receives the treatment, preventing subconscious expectations from altering results
How does natural selection work?
Natural selection is the primary mechanism of evolution. Within any population, individuals have random genetic variations.
How do evolutionary "trade-offs" explain the survival of seemingly disadvantageous traits?
Discusses costs versus benefits in adaptations, such as the peacock's tail.
Why is it essential for other scientists to replicate an experiment's results?
Replication ensures the findings are reliable, consistent, and not caused by random chance.
Why are transitional fossils critical to evolutionary biology?
They provide physical evidence of intermediate forms, linking ancient ancestral species to modern descendants.
What is a peer review, and why is it critical before publication?
It is an evaluation by independent experts in the same field to check for errors and ensure validity
Did humans evolve from modern monkeys or apes?
No, humans did not evolve from monkeys. Instead, humans and modern apes (like chimpanzees and gorillas) share a common ancestor that lived millions of years ago.
How can a random, accidental genetic mutation drive complex evolutionary change?
Explores how mutations act as the raw material for variation and natural selection
What is the key difference between a scientific theory and a scientific law?
A law describes what happens, while a theory explains why or how it happens.
Why do organisms retain vestigial structures that serve no current purpose?
These structures are evolutionary leftovers from an ancestor that did use them, and they haven't been selected against.
Why can a scientific theory never be proven as absolute, permanent truth?
New technology or evidence can always emerge in the future to modify or disprove the theory.
New species form through a process called speciation. This usually happens when a population of a species becomes geographically isolated from the rest.