Question

The key to speciation is ___ of populations.
1. extinction
2. reproductive health
3. reproductive isolation
4. endanger​

Answer 1

Answer:

1.extinction

Explanation:

the key of speciation is extinction of populations.

Answer 2

Reproductive isolation is the key to the speciation of populations (Option - 3).

• Speciation is the slow evolution or development of a new species.
• Reproductive isolation is the process by which individuals of the same species are not able to mate and reproduce leading to the development of new species eventually.
• It can be of a physical, behavioral, physiological, or genetic barrier.
• Physical: if individuals of the same species are separated due to a geographical barrier such as a river or mountain leading to the development of new species.
• The Physiological barrier or genetic barrier includes the following:
• Pre-zygotic: when the individuals are not able to mate due to differences in the time of reaching sexual maturity ex. in the case of certain plants.
• Post zygotic: zygote mortality i.e. the zygote dies as it is formed or sterile hybrid.
• i.e. a hybrid is formed on the mating of 2 individuals but the hybrid is unable to reproduce leading to the development of new species ex. Mule.