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Question

Long - term patterns of evolution are shaped by large scale process(s) such as :
(I) Speciation
(II) Mass extinction
(III) Adaptive radiation
Choose the correct answer:

The correct answer is
(I), (II) and (III)

Evolutionary Patterns Shaped by Large-Scale Processes

Long-term evolutionary patterns are influenced by significant events and processes that operate on broad timescales. Let's examine the given factors:

Key Evolutionary Processes

  • Speciation: The fundamental process through which new species arise. It directly contributes to the diversification of life and shapes the branching patterns observed in the history of life.
  • Mass Extinction: Events causing widespread and rapid decrease in the amount of life on Earth. These events drastically alter ecosystems, eliminate dominant groups, and create opportunities for surviving lineages to diversify, thus redirecting long-term evolutionary trajectories.
  • Adaptive Radiation: The rapid diversification of a lineage into multiple species that occupy different ecological niches. This process often occurs after mass extinctions or when new environments become available, filling the 'gaps' and creating distinct evolutionary patterns.

Conclusion on Evolutionary Drivers

All three processes—speciation, mass extinction, and adaptive radiation—are recognized as major drivers that shape the large-scale patterns of evolution observed over long periods. Speciation generates biodiversity, mass extinctions cause major turnovers, and adaptive radiation fills the resulting ecological space.

Therefore, all the listed items (I), (II), and (III) are relevant.

Final Answer Determination

Considering the role of each process:

  • Speciation (I) drives diversification.
  • Mass Extinction (II) causes major evolutionary shifts.
  • Adaptive Radiation (III) leads to diversification into new niches.

All these factors significantly influence the long-term patterns of evolution.

The correct option includes all three: (I), (II), and (III).

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Important Questions from Evolutionary Mechanisms

  1. The frequency of homozygotes in a diploid population is 0.68. Assuming that the population is in Hardy-Weinberg equilibrium, the frequencies of the two alleles are

  2. Convergent evolution creates:

  3. Given below are the possible reasons of high probability for extinction of species:

    (i) Increased homozygosity of alleles

    (ii) Increased heterozygosity of alleles

    (iii) Decreasing population sizes

    (iv) Increasing demographic stochasticity

    (v) Decreasing environmental stochasticity

    Which one of the following options represents the correct combination of reasons that can lead to the highest probability of extinction of species?

  4. Given below are proposed analogous structures among organisms.

    A. wings of birds and bats

    B. wings of bats and tetrapod digits

    C. tendrils of Vitis and tendrils of pumpkin

    D. tubers of potatoes and sweet potatoes

    E. fins of fish and flippers of a whale

    Which one of the following options correctly states the analogous structures?

  5. According to Hamilton's rule, 'r' is the coefficient of relatedness between two interacting individuals, 'B' is the benefit to thr recipient and 'C' is the cost to the donor. Which of the following relationships will result in an altruistic behaviour?

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