Question

evidence of evolution review
introduction: evolution is not just a historical process; it is occurring at this moment. populations commonly adapt to responses to changes in their environments and thereby accumulate changes in the genes that are available to the species through its gene pool. in today’s lab you will explore some of the evidence for evolution and will examine a few of the mechanisms through which evolution occurs. in this laboratory you will review some of the classic examples used as evidence for evolution. keep in mind that the support goes far beyond these simplistic examples and this selection is only intended as an introduction to the subject.
pre - questions

1. what is a theory?

how is a theory like a law? how is a theory different than a law?

1. what is evolution? 3. how does natural selection cause evolution?

review lesson 1: comparative anatomy
the discipline of comparative anatomy is important in understanding relationships between present - day organisms.

Explanation:

1. A theory is a well-substantiated, evidence-based explanation of natural phenomena, built from tested hypotheses and observations.
2. A theory and a law both rely on empirical evidence and describe natural phenomena. Laws summarize consistent observed patterns, while theories explain why those patterns occur.
3. A theory explains the underlying mechanisms/why of phenomena, while a law is a descriptive statement of what consistently occurs in nature.
4. Evolution is the process of heritable changes in populations of organisms over successive generations, driven by mechanisms like natural selection, leading to genetic diversity and the emergence of new species.
5. Natural selection causes evolution by favoring individuals with traits that improve survival and reproduction in their environment. These advantageous traits are passed to offspring, increasing their frequency in the population over time; less favorable traits become less common, leading to gradual population adaptation and species change.

Answer:

1. A theory is a well-supported, evidence-based explanation of natural phenomena, derived from tested hypotheses and repeated observations.
2. Both are evidence-based descriptions of natural systems; laws note consistent patterns, theories explain those patterns.
3. A theory explains why natural phenomena occur, while a law describes what consistent, observable patterns exist in nature.
4. Evolution is the gradual heritable change in a population's genetic makeup across successive generations, leading to diversity and new species.
5. Natural selection acts on heritable traits: individuals with traits suited to their environment survive and reproduce more, passing those traits to offspring. Over time, these favorable traits become more common in the population, driving evolutionary change and adaptation.