nmdcat.online
BIO NMDCAT Darwinism
nmdcat.online July 14, 2026

According to Darwinism, what is the primary mechanism of speciation (the formation of new species)?

A. A single organism undergoing a massive, sudden physical transformation.
B. The gradual accumulation of distinct adaptive variations in geographically isolated populations over long periods.
✓
C. The direct hybridization of two completely unrelated phyla.
D. The rapid extinction of all male members of a population.

📝 Explanation

Speciation occurs gradually as populations diverge genetically and phenotypically in response to different selective pressures, eventually leading to reproductive isolation.

📖 Additional Information

  • A single organism undergoing a massive, sudden physical transformation.
  • The gradual accumulation of distinct adaptive variations in geographically isolated populations over long periods.
  • The direct hybridization of two completely unrelated phyla.
  • The rapid extinction of all male members of a population.

Speciation occurs gradually as populations diverge genetically and phenotypically in response to different selective pressures, eventually leading to reproductive isolation.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

Which of the following statements about Charles Darwin's voyage on the HMS Beagle is correct?

Next Question

Which of the following is a classic example of "disruptive selection" in nature?

Back to All Questions

🔗 Related MCQs

Concerning the duration of muscle twitches, if a skeletal muscle twitch lasts approximately 10-100 milliseconds, what is the expected duration of a typical smooth muscle contraction?
July 28, 2026
The physiological response to hypoxia (low oxygen) differs among muscle types. Which muscle type is most susceptible to irreversible damage following a brief period of hypoxia?
July 28, 2026
A medical relevance of understanding muscle tissue differences is the development of calcium channel blockers. These drugs are primarily used to treat hypertension (high blood pressure) and angina. They exert their biological effect mainly by acting on:
July 28, 2026
During the process of cell differentiation, which muscle type loses its ability to divide and form new cells almost completely, relying solely on hypertrophy for growth?
July 28, 2026
The functional relationship between the shape of a muscle cell and its tissue type is evident when observing spindle-shaped cells. This specific morphology allows the cells to:
July 28, 2026

Categories

View all →