Podcast
Questions and Answers
Which of the following describes a necessary condition for changes in the finch populations to occur?
Which of the following describes a necessary condition for changes in the finch populations to occur?
- Limited food resources (correct)
- Plentiful water sources
- Lack of predators
- All of the above
Which of these would have the least effect on natural selection in a geographically isolated subspecies of giraffes?
Which of these would have the least effect on natural selection in a geographically isolated subspecies of giraffes?
- Environmental changes
- Chromosome number (correct)
- Food availability
- Genetic mutations
What are mutations within a DNA sequence?
What are mutations within a DNA sequence?
Natural processes that produce genetic diversity
Which of the following best illustrates natural selection?
Which of the following best illustrates natural selection?
How will genetic drift probably affect a small population of chimpanzees in a stable habitat?
How will genetic drift probably affect a small population of chimpanzees in a stable habitat?
Which of the following is NOT part of Darwin's observations that describe the mechanisms of natural selection?
Which of the following is NOT part of Darwin's observations that describe the mechanisms of natural selection?
What did Theodosius Dobzhansky's discovery about successful species help explain?
What did Theodosius Dobzhansky's discovery about successful species help explain?
Flashcards
Necessary condition for finch changes?
Necessary condition for finch changes?
A factor without which finch population changes cannot occur; it drives competition.
Effect of genetic drift on small populations?
Effect of genetic drift on small populations?
Random changes in allele frequencies that reduce genetic diversity, especially potent in small groups.
What are DNA mutations?
What are DNA mutations?
Spontaneous alterations in DNA that create the raw material for evolutionary change by introducing new traits.
Natural Selection
Natural Selection
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Dobzhansky's Discovery
Dobzhansky's Discovery
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Not part of Darwin's observations?
Not part of Darwin's observations?
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Study Notes
Natural Selection Concepts
- Drier climates on islands led to shifts in finch populations due to limited food resources, favoring finches with specific beak shapes for efficient feeding.
- Chromosome number does not significantly influence natural selection, particularly in isolated giraffe subspecies.
- DNA mutations are natural events that generate genetic diversity, essential for natural selection to function effectively.
Mechanisms of Natural Selection
- Organisms exhibiting favorable genetic traits are more likely to survive and reproduce, illustrating the concept of natural selection.
- A prolonged stable habitat for a small chimpanzee population may result in reduced genetic diversity due to genetic drift, which changes allele frequencies randomly over time.
Darwin's Contributions
- Charles Darwin, in "On the Origin of the Species," detailed species evolution over time but did not specifically characterize the process of natural selection as the descent of species with modifications from ancestors.
Genetic Diversity and Adaptation
- Theodosius Dobzhansky found that species with higher genetic diversity are better equipped to adapt to environmental changes, ensuring their survival amidst fluctuations in habitat conditions.
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