(I) Speciation
(II) Mass extinction
(III) Adaptive radiation
Choose the correct answer:
Long-term evolutionary patterns are influenced by significant events and processes that operate on broad timescales. Let's examine the given factors:
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.
Considering the role of each process:
All these factors significantly influence the long-term patterns of evolution.
The correct option includes all three: (I), (II), and (III).
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?
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.
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:
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