History of Evolutionary Theory
This scientist proposed natural selection as the mechanism of evolution.
Who is Charles Darwin?
This is a segment of DNA that codes for a single trait.
What is a gene?
This term describes all the alleles present in a population.
What is a gene pool?
This condition describes a population where allele frequencies do not change.
What is genetic equilibrium?
This is the formation of new species.
What is speciation?
This missing concept limited Darwin’s original theory.
What is the mechanism of inheritance?
These are alternative forms of a gene.
What are alleles?
This term refers to how often a specific allele appears in a population.
What is allele frequency?
This principle describes a population that is not evolving.
What is the Hardy-Weinberg principle?
This type of isolation occurs when populations are physically separated.
What is geographic isolation?
This scientist discovered the basic principles of inheritance using pea plants.
Who is Gregor Mendel?
These are the three main sources of genetic variation in populations.
What are mutation, recombination, and sexual reproduction?
These must change in order for evolution to occur.
What are allele frequencies?
This occurs when Hardy-Weinberg conditions are not met.
What is evolution?
This type of selection favors both extreme phenotypes over intermediate ones.
What is disruptive selection?
This discovery explained how genetic information is copied and passed on.
What is the structure of DNA?
This process involves homologous chromosomes exchanging segments during meiosis.
What is crossing-over?
This is the allele frequency when 9 out of 20 alleles are dominant.
What is 0.45 or 45%?
These are the five agents that can cause changes in allele frequencies.
What are mutation, gene flow, genetic drift, nonrandom mating, and natural selection?
This type of speciation occurs due to geographic barriers.
What is allopatric speciation?
This field combines Mendelian genetics with Darwinian evolution.
What is population genetics?
This is the approximate number of different gametes humans can produce from independent assortment alone.
What is about 8.4 million?
These tend to remain constant even when phenotypic ratios change (in stable populations).
What are allele frequencies?
This mechanism of evolution consistently improves adaptation to the environment.
What is natural selection?
This type of reproductive barrier prevents fertilization from occurring.
What is prezygotic isolation?