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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. 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?

  2. Biased gene conversion (BGC) has been proposed to cause changes in allele frequencies in a population. Select the statement that is NOT correct about BGC.

  3. Speciation means :
  4. Match List I with List II
     

    List I (Term)List II (Definition)
    A. Sympatric
    speciation                
    I. The process by which organisms adapt to changed environmental conditions to form new species in
    a relatively short period.
    B. Parapatric
    speciation
    II. The process of differentiation and acquiring reproductive isolation within the same geographical
    area.
    C. Adaptive
    radiation
    III. Population evolving in different geographical regions due to isolation.
    D. Allopatric
    speciation
    IV. The process of speciation which occurs between adjacent populations within a broadly continuous
    habitat.


    Choose the correct answer from the options given below:

  5. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R 

    Assertion A: Theoretically, natural selection moulds and shapes populations through differential fertility and mortality. 

    Reason R: Sickle cell provides a persuasive argument for differential mortality, affecting populations in malarial environment, but evidence for differential fertility is far from unequivocal. 

    In the light of the above statements, choose the most appropriate answer from the options given below

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