AP Bio

Reduced hybrid viability

Many species of frogs can interbreed, but they produce embryos that die early on.

Temporal isolation

One species of fruit fly hatches every 13 years, while another hatches every 17 years.

Mechanical isolation

Different flower species have stamens and styles that can only be pollinated by certain insects.

Reduced hybrid fertility

Lions and tigers can mate to produce ligers, but ligers are sterile.

Behavioral isolation

Eastern and western male meadowlarks have different mating calls.

Habitat isolation

While in the same geographical area, one species of ant occupies tree bark, while another species of ant burrows underground.

Behavioral isolation

Females from one species of firefly can only recognize the flashing patterns of males in their own species.

Reduced hybrid viability

Some species of salamander may interbreed, but most hybrids do not complete development.

Temporal isolation

Many orchid species flower on different days.

Reduced hybrid viability

Domestic sheep and domestic goats have different numbers of chromosomes preventing a zygote from developing normally.

True

Darwin observed that most organisms produce more than one or two offspring. This observation led directly to his hypothesis that individuals within a population compete for limited resources.

False

Natural selection acts on genotypes.

True

Individuals can be acted on by natural selection, but only populations evolve.

False

The fossil record gives a complete visual of evolutionary change over time.

True

Referring to a cladogram, the root represents the common ancestor of all of the species in that cladogram.

False

The primary difference between phylogenetic trees and cladograms, is that cladograms show the amount of change over time.

True

DNA is the most accurate evidence for understanding evolutionary relationships.

True

Biogeography is the distribution of animals and plants geographically.

False

Structures that are present but no longer serve a purpose are known as homologous structures.

True

Taxonomy is the naming and classifying of species.