Question

Give examples on the reproductive isolating mechanisms. MECHANISM EXAMPLES
1.Geographic Isolation 1.
2.
3.
2.Temporal or Seasonal Isolation 1.
2.
3.
3.Behavioral Isolation 1.
2.
3.
4.Mechanical Isolation 1.
2.
3.
5.Gametic Isolation 1.
2.
3.

Answer 1

Answer:

Explanation:

1) Pre-mating isolating mechanisms. Factors which cause species to mate with their own kind (assortative mating).

a) Temporal isolation. Individuals of different species do not mate because they are active at different times of day or in different seasons.

b) Ecological isolation. Individuals mate in their preferred habitat, and therefore do not meet individuals of other species with different ecological preferences.

c) Behavioral isolation. Potential mates meet, but choose members of their own species.

d) Mechanical isolation. Copulation is attempted, but transfer of sperm does not take place.

2) Post-mating isolating mechanisms. Genomic incompatibility, hybrid inviability or sterility.

a) Gametic incompatibility. Sperm transfer takes place, but egg is not fertilized.

b) Zygotic mortality. Egg is fertilized, but zygote does not develop.

c) Hybrid inviability. Hybrid embryo forms, but of reduced viability.

d) Hybrid sterility. Hybrid is viable, but resulting adult is sterile.

e) Hybrid breakdown. First generation (F1) hybrids are viable and fertile, but further hybrid generations (F2 and backcrosses) may be inviable or sterile.

Answer 2

Reproductive isolating mechanisms  :Anything that prevents mating and fertilization is a prezygotic mechanism.  

• Habitat isolation, behavioral isolation, temporal isolation, mechanical isolation and gametic isolation are all examples of prezygotic isolating mechanisms.  
• Examples are -1. Birds migrating into another place
• 2. crocodiles moving because of the division of the large lake into several lake.
• 3. The movement of glacier
• Mechanical isolation also exists in plants.
• One of the most notable examples of mechanical isolation in plants is the isolation that exists between white sage and black sage.
• While the two species of sage share a geographical range, the two species can’t interbreed because they rely on different pollinators.
• Temporal or Seasonal iIsolation :. Tiger and wood frogs achieve sexual maturity at separate .
• Behavioural isolation: Potential mates meet, but choose members of their own species.
• Mechanical isolation. Copulation is attempted, but transfer of sperm does not take place.
• .  Gametic isolation : Incompatibility, Sperm transfer takes place.