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.

speciation is the development of new species over time. what is the difference between allopatric speciation and sympatric speciation?
choose the correct sympatric prezygotic barrier for each scenario below. choices: behavioral isolation, habitat isolation, temporal isolation

1. some individuals in a population of salamanders prefer a terrestrial environment to other individuals who 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.

draw a picture showing each type of speciation. below your drawing, describe how your picture represents the speciation.

Explanation:

1. Ligers are not a species. By the biological species concept, a species is a group of organisms that can inter - breed and produce fertile offspring. Since ligers are sterile and cannot reproduce, they do not meet this criterion.
2. Allopatric speciation occurs when a population is separated by a physical barrier (geographical isolation), leading to genetic divergence over time. Sympatric speciation occurs within the same geographical area, often due to factors like polyploidy or behavioral changes, without a physical barrier separating the population.

3.

• Salamanders: Habitat isolation as some prefer terrestrial and others aquatic environments.
• Crickets: Behavioral isolation as their chirping behavior is different.
• Flowering plants: Temporal isolation as they breed at different times of the year.

Answer:

1. Ligers are not a species because they are sterile and cannot reproduce.
2. Allopatric speciation involves geographical separation; sympatric speciation occurs in the same area without geographical barriers.

3.

• Salamanders: Habitat isolation
• Crickets: Behavioral isolation
• Flowering plants: Temporal isolation