Given below are statements on “living fossils’. Select the correct statements. (1) Living fossils are impressions of extant organisms in old rocks. (2) Living fossils show high morphological divergence from […]
Blog
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
How Multi-Gene Families Evolve: The Role of Duplication and Unequal Crossing Over
Evolution of multi-gene family occurs by (1) only gene duplication. (2) only unequal crossing-over. (3) random mutations. (4) both duplication and unequal crossing over. How Multi-Gene Families Evolve: The […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Why Did Snakes Lose Their Limbs? The Evolutionary Science Behind Limb Loss
During evolution the limbs of snakes were lost. Thecorrect explanation for this is (1) Limbs degenerated due to disuse (2) This was more adapted (3) Limbs reduced the fitness of […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
Why Convergent Evolution Is Most Unlikely for Gene Base Sequences
For which, of the following characters, convergent evolution is most unlikely? (1) Locomotor organs. (2) Secondary metabolites. (3) Conditionally expressed genes. (4) Base sequence of a gene. Why Convergent […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Pelvic Girdle and Hind Limbs in Pythons: A Classic Example of Vestigial Organs
Pelvic girdle and hind limbs in python are example of- (1) Analogous organ (2) Homologous organ (3) Vestigial organ (4) Orthologous organ Introduction The python, a member of the snake […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Convergent Evolution: How Analogous Structures Arise in Nature
Convergent evolution creates: (1) Analogous structures (2) Homologous structures (3) Synapomorphies (4) Pleiotropic structures Introduction Evolution is a powerful force shaping the diversity of life on Earth. One of its […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
The Phylogenetic Species Concept: Defining Species with Morphological and Molecular Evidence
Which species concept utilizes morphological and molecular characters to distinguish between species? (1) Evolutionary (2) Ecological (3) Biological (4) Phylogenetic The Phylogenetic Species Concept: Defining Species with Morphological and […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Convergent Evolution Explained: Why Bird and Bat Wings Are a Classic Example of Homoplasy
Which of the following is an example of convergent evolution (homoplasy)? (1) The wings of birds and bats (2) The hemoglobin gene family (3) The ribosomal RNA genes (4) The […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Fossils of the Same Freshwater Reptile in South America and Africa: The Gondwana Connection Explained
Fossils of the same species of fresh water reptiles have been found in South America and Africa. Based on the current understanding. Which of the following is the best possible […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
Gene Cluster Evolution: Why Exon Shuffling Alone Can’t Explain Mayfair Gene Patterns
Mayfair genes (HYPOTHETICAL) consist of a superfamily of transcription factors. They are found in 4 clusters in mammals; in 2 clusters in insects; and in a single cluster in an […]
