24.1 Identification of Species

George Gaylord Simpson

________ was a tologist when members of two different species interbreed.

study

A(n) ________ done by E. O. Wilson and colleagues in 1990 estimated the known number of species, but this approach has drawbacks.

hybrid mechanism

The ________ does not reach the egg cell.

ecotype

What is adapted to its environment? Answer with a single words or term.

Biologists

________ agree that distinguishing between species is a more difficult task, even though this may seem like a reasonable way to do it.

Interspecies

________ hybrid or incompatible genitalia prevent two species from interbreeding.

Evolutionary biologists

________ would duce at different times of the day.

Sea urchins

________ may release sperm and female choice at the same time, which is an example of prezygotic or postzygotic eggs.

Researchers

________ may have difficulty with more than one million.

Male dragonflies

________ use a pair of appendages to grasp females during copulation.

Prezygotic mechanisms

________ tend to be more common than postzygotic mechanisms in nature.

interspecies hybrid

What is sterile? Answer with a single words or term.

Postzygotic

________ is when sperm and egg cells are released into the water.

unique set of habitat resources

The ________ may be a barrier to interbreeding.

physical characteristics of different species

The ________ are what biologists use to distinguish a unique species.

Biologists

________ may decide that certain populations are unique.

Biologists

________ have discovered that there are two species in which they look for food.

Biologists

________ compare the genes within the cells of two different species individuals to see how simi can interbreed in nature and still maintain their lar or different appearance.