Question

after the show (answer after viewing the video)

1. a tiger and a lion are two different species that are bred to produce ligers. ligers cannot interbreed to reproduce. are ligers a species? explain why or why not.

1. speciation is the development of new species over time. what is the difference between allopatric speciation and sympatric speciation?

write the correct sympatric prezygotic barrier for each scenario below.
answer choices: behavioral isolation, habitat isolation, temporal isolation

1. some individuals in a population of salamanders prefer a terrestrial environment to other individuals that prefer an aquatic environment.
2. some crickets of the same species chirp differently than the majority of this species of crickets.
3. some flowering plants of the same species breed at different times of the year.

extension
sketch a picture showing each type of speciation. below your drawing, describe how your pictures shows that type of speciation.
allopatric speciation

sympatric speciation

Explanation:

1. A key species criterion is the ability to interbreed and produce fertile offspring. Ligers cannot interbreed to reproduce, so they do not meet this criterion.
2. Allopatric speciation requires geographic separation of populations; sympatric speciation occurs in the same geographic area.
3. Habitat isolation refers to preferences for different environments preventing mating.
4. Behavioral isolation involves distinct behaviors (like unique chirps) that block mating.
5. Temporal isolation is when breeding occurs at different times.

Answer:

1. No; ligers cannot interbreed to reproduce, so they are not a species.
2. Allopatric speciation needs geographic separation; sympatric does not.
3. habitat isolation
4. behavioral isolation
5. temporal isolation
6. (Drawing for allopatric: e.g., a river separating two bird populations; description: geographic barrier splits the population, leading to divergence. Drawing for sympatric: e.g., apple maggot flies on different fruit trees in the same area; description: no geographic barrier, but habitat preference causes isolation.)