Reduced hybrid fertility is a barrier to speciation that occurs when

Competition is a type of ______ interaction.

In species in which offspring require a high level of parental care after birth, mating tends to be ______.

The most common pattern of dispersion in a population is ______. This pattern can exist as a result of different soil conditions over the area, due to the locations of micro-environments, or even due to mating behavior.

Within an ecosystem, which of the following best explains why organisms from higher trophic levels typically account for less biomass than those from lower trophic levels?

In a population of flowering plants, there are two alleles for flower color. One is dominant and is represented A, one is recessive and is represented a.  The allele frequency of A is 0.7. What is the allele frequency of a?

In a population of 1000 flowering plants, there are two possible alleles for flower color, one dominant and one recessive. 400 plants are homozygous dominant, 200 plants are heterozygous, and 400 plants are homozygous recessive. How many total alleles are in the gene pool?

  Male red-winged blackbirds defend high-quality territories using vocal displays and bright plumage. Females actively observe these displays to select a mate, as the best territories provide superior protection for their offspring. This process, where the female chooses a partner based on the quality of his territory and physical signals, is an example of:

The orca, or “killer whale” is actually part of the dolphin family, called Delphinidae, and is referred to by the scientific name Orcinus orca. What is the name of the genus?

Which of the following is NOT a source of water vapor in the atmosphere?