Evolution Flashcards

Evolution is the process through which species of organisms undergo changes over time through variations in their genetic material, resulting from mechanisms such as mutations, gene flow, genetic drift, and natural selection.

Natural selection is a key mechanism of evolution that involves the survival and reproduction of individuals that are better adapted to their environment.

Charles Darwin first extensively detailed the theory of evolution in his 1859 book 'On the Origin of Species.'

Genetic drift is a mechanism of evolution that refers to random changes in the frequency of alleles within a population, often having a more pronounced effect in small populations.

Alleles are different versions of a gene found at the same locus on a chromosome, which can lead to variations in traits.

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable physical or biochemical characteristics resulting from the interaction of the genotype with the environment.

The founder effect is a concept in population genetics that describes the reduced genetic diversity that occurs when a small group of individuals establishes a new population.

The bottleneck effect describes a sharp reduction in the size of a population due to environmental events or pressures, leading to a loss of genetic diversity.

Gene flow, also known as gene migration, is the transfer of genetic material from one population to another, often through interbreeding.

The Galápagos Islands were crucial in Charles Darwin's formulation of his theory of evolution by natural selection due to their unique and diverse wildlife.

'On the Origin of Species' is significant as it laid the foundation for modern scientific understanding of evolution and introduced the theory of natural selection.

Convergent evolution is the independent evolution of similar features in species of different periods or epochs, leading to analogous structures.

An example of genetic drift is the 'marbles in a jar' analogy, where random selection can lead to changes in allele frequencies over generations.

The Galápagos penguin is significant as it is the only penguin species that lives north of the equator and has adapted to the warmer climate of the islands.

Fossil records provide direct evidence of past life, allowing scientists to reconstruct phylogenetic relationships and understand the timing and mechanisms of evolutionary change.

Genetic diversity is important for the adaptability and survival of populations, helping them withstand environmental changes and resist diseases.

Darwin's observations in the Galápagos Islands were crucial in developing his ideas on natural selection, as he noted the unique adaptations of species to their environments.

The bottleneck effect can lead to a loss of genetic variation, making populations more susceptible to diseases and limiting their ability to adapt to new selective pressures.

Gene flow increases genetic diversity within populations by introducing new alleles, which can enhance adaptability and survival.

The genotype provides the genetic code, while the phenotype is the visible or measurable expression of that code, influenced by environmental conditions.

Transitional fossils provide compelling evidence for evolution by illustrating gradual changes and bridging gaps in the fossil record.

Natural selection drives the gradual adaptation of species to their environments by favoring individuals with advantageous traits.

The founder effect can lead to unique genetic traits or increased prevalence of certain genetic disorders due to reduced genetic variation in the new population.

Examples of convergent evolution include the evolution of flight in insects, birds, and bats, as well as the development of camera eyes in different species.