Genetic Drift
A random change in allele frequencies in a population.
What is genetic drift?
This process causes individuals with advantageous traits to survive and reproduce more successfully.
What is natural selection?
These structures in different species are similar because of a shared ancestry.
What are homologous structures?
This field of study focuses on the early stages of development in animals.
What is embryology?
The movement of alleles between populations
What is Gene Flow?
his effect occurs when a population is drastically reduced in size due to a natural disaster, reducing genetic diversity.
What is Bottleneck Effect?
This term describes a trait that improves an organism's chance of survival and reproduction.
What is an adaptation?
These are two examples of homologous structures.
What are a human arm and whale flipper?
This is one feature that embryos of vertebrates share in early development.
What are pharyngeal slits or tails?
Gene flow increases this in a population.
What is genetic diversity?
This effect occurs when a small group of individuals starts a new population, leading to a different allele frequency than the original population.
What is the Founder Effect?
This phrase describes how the best-adapted individuals pass their traits to the next generation.
What is survival of the fittest?
These structures have similar functions but evolved independently in unrelated species.
What are analogous structures?
This is why scientists study embryos to understand evolution.
What is to identify similarities that suggest common ancestry?
An example of gene flow in plants involves this natural process.
What is pollination?
This size of population is most affected by genetic drift.
What is a small population?
Variation in this is essential for natural selection to occur.
What are traits?
These are two examples of analogous structures.
What are the wings of a bird and the wings of an insect?
In early embryonic development, humans and fish share this structure, which eventually develops into very different features.
What are gill slits (or pharyngeal arches)?
This is one barrier that might prevent gene flow between populations
What is isolation?
This is the key difference between genetic drift and natural selection.
What is genetic drift is random, while natural selection depends on advantageous traits?
Over time, natural selection can lead to the creation of these distinct groups of organisms.
What are new species?
Homologous structures provide evidence for this scientific theory.
Homologous structures provide evidence for this scientific theory.
This part of embryonic development provides evidence that mammals, birds, and reptiles once shared a similar environment.
What is the amniotic sac?
This process helps populations adapt to environmental changes by introducing new alleles.
What is gene flow?