Question

vocabulary review (fill in the blanks)

1. a______is a group of organisms that can interbreed and produce fertile offspring.
2. the process by which new species form from existing ones is called______.
3. when two populations can no longer mate and produce fertile offspring, they are______isolated.

4.______isolation happens when populations are separated by physical barriers such as mountains or rivers.

1. when two groups have different mating songs, dances, or courtship behaviors, it is called______isolation.
2. if two populations reproduce at different times of the year, they experience______isolation.
3. when a small group becomes isolated at the edge of a population and evolves into a new species, this is______speciation.

8.______speciation happens when populations are separated by geography.
9.______speciation happens when new species form even though populations live in the same area.

1. the main cause of speciation is______isolation, which stops gene flow between populations.

short answer questions

1. what must happen for one species to split into two new species?
2. why is reproductive isolation important in the process of speciation?

Explanation:

1. A species is defined as a group of organisms that can interbreed and produce fertile offspring.
2. Speciation is the process of new species formation from existing ones.
3. Reproductive isolation occurs when two populations can't mate and produce fertile offspring.
4. Geographic isolation involves separation by physical barriers like mountains or rivers.
5. Behavioral isolation is due to different mating behaviors (songs, dances, etc.).
6. Temporal isolation happens when reproduction times differ.
7. Allopatric speciation occurs when a small group isolates and evolves.
8. Allopatric speciation is related to geographic separation.
9. Sympatric speciation occurs in the same area.
10. Reproductive isolation stops gene flow, a main cause of speciation.

For short - answer questions:

1. Reproductive isolation must occur (populations must stop interbreeding and exchanging genes).
2. Reproductive isolation stops gene flow. Different genetic changes accumulate in isolated populations, leading to enough differences for new species.

Answer:

1. species
2. speciation
3. reproductively
4. Geographic
5. behavioral
6. temporal
7. allopatric
8. Allopatric
9. Sympatric
10. reproductive
11. Reproductive isolation (populations must stop interbreeding and exchanging genes).
12. Reproductive isolation stops gene flow. Different genetic changes accumulate in isolated populations, leading to enough differences for new species.