Genes and Variation
A version of a gene is known as this.
What is an allele?
This term refers to a change in the sequence of an organism’s DNA.
What is mutation?
New species will develop because part of the population is ______________ from another part of the population.
What is isolated?
This type of selection occurs when individuals with only one type of extreme phenotype are more successful than others within the population.
What is directional selection?
Changes in a population leading to speciation that occur very slowly (over millions of years).
What is gradualism?
This term refers to all of the genes and their alleles within a population.
What is a gene pool?
Any exception that breaks the Hardy-Weinberg Genetic Equilibrium of a population will result in this.
What is evolution?
Study of the internal and external structures and appearance of an organism.
What is morphology?
The role of chance on a population’s allele frequency is known as this.
What is genetic drift?
The home habitat of snarks has been split in two by an impassable river, resulting in two distinct snark species. This is an example of this type of reproductive isolation.
What is geographic isolation?
In a population, variation in how something looks.
What is phenotypic variation?
The study of evolution from a genetic point of view.
What is population genetics?
When populations are separated by physical barriers (such as mountains, oceans, or rivers) which eventually leads to specieation.
What is geographic isolation?
The situation in which allele frequencies remain constant, which is not possible in natural ecosystems, is known as this.
What is genetic equilibrium?
The modern concept of a species takes both of these into consideration.
What is morphology and whether individuals can interbreed and produce viable young?
In a population, variation in the allele combination of a particular gene.
What is genetic variation?
A chance event that changes the allele frequencies of a population.
What is genetic drift?
This type of selection results in reductions of the frequencies of extreme phenotypes in a population and the increase in prevalence of the average phenotype.
What is stabilizing selection?
The five conditions necessary for Hardy-Weinberg genetic equilibrium are these.
What are random mating, large populations, no movement in or out of alleles, no mutations, and no natural selection?
Two related species of pretty pink flowers bloom and are fertilized months apart.
What is reproductive isolation?
These are the three main sources of genetic variation within populations.
What are mutation, recombination, and random pairing of gametes?
Movement of genes from one population to another, either through immigration/emigration or by seeds/pollen moving.
What is gene flow?
This type of selection occurs when individuals with more extreme phenotypes have greater reproductive success when compared to those with intermediate phenotypes.
What is disruptive selection?
The process when species living in the same areas, but can no longer viably reproduce with its original population is known as this.
What is reproductive isolation?
The three things that cause non-random mating.
What is assortative mating, sexual selection, and geographic proximity?