4) Isolation

When does reproductive isolation occur?

when members of different populations can no longer mate successfully with each other

What occurs when members of different species can no longer mate successfully with each other?

reproductive isolation

What is speciation?

the rise of two or more species from one existing species

What is the rise of two or more species from one existing species?

speciation

What is the last step of speciation?

reproductive isolation

Reproductive isolation is the last step of what?

speciation

What kinds of barriers can isolate populations and prevent mating?

behavioral , temporal, and geographic

Behavioral, temperal, and geographic are the kinds of barriers that do what?

isolate populations and prevent mating

What is behavioral isolation caused by?

differences in courtship or mating behaviors

What are caused by differences in courtship or mating behaviors?

behavioral isolation

What are examples of behavioral isolation?

chemical scents, courtship dances or songs

Chemical scents, courtship dances or songs are examples of what?

behavioral isolation

Changes in mating signals may arise through what?

genetic drift or natural selection

In behavioral isolation, what may arise through genetic drift or natural selection?

changes in mating signals

When does temporal isolation occur?

when timing prevents reproduction between populations

What occurs when timing prevents reproduction between populations?

temporal isolation

What may lead to some members of a population to show signs of courtship at different times?

increased competition for mates during the annual mating season

Increased competition for mates during the annual mating season may lead to what?

some members of a population to show signs of courtship at different times

What do geographic barriers involve?

physical barriers that divide a population into two or more groups

What involves physical barriers that divide a population into two or more groups?

geographic barriers

What are examples of physical barriers?

mountains, rivers, lakes, urbanization

Mountains, rivers, lakes, urbanization are examples of what?

physical barriers

Isolated populations will have so many changes in their DNA that attempts at mating would only produce what?

sterile or nonviable offspring

Isolated will have so many what that attempts at mating will only produce sterile or nonviable offspring?

changes in their DNA