Evidence of evolution | Class 12 Biology

Evidence of evolution | Class 12 Biology

About This Video ........................

In This Video Lecture You Will Learn Basic Concept Of Evidence of evolution
Biogeography :It was the geographical distribution of species— biogeography— that
America. The evolutionary view of biogeography predicts that contemporary armadillos
are modified descendants of earlier species that occupied these continents, and the
first suggested the idea of evolution to Darwin. Islands have many species of plants
or neighboring island. Consider armadillos, the armored mammals that live only in
and animals that are endemic but closely related to species of the nearest mainland
fossil record confirms that such ancestors existed.
The Fossil Record : The succession of fossil forms is a strong evidence in favour of
Another example is the chronological appearance of the different classes of vertebrate
next, followed by reptiles, then mammals and birds. This sequence is consistent with
prokaryotes.
biology places prokaryotes as the ancestors of all life, and predicts that bacteria should
precede all eukaryotic life in the fossil record. Indeed, the oldest known fossils are
the history of vertebrate descent. The evolution of horse provides an example of such
an organism. For instance, evidence from biochemistry, molecular biology, and cell
evolution. It provides a visual record in a complete series showing the evolution of
animals in the fossil record. Fossil fishes, the earliest vertebrates, with amphibians a history.
Comparative Anatomy : Anatomical similarities between species grouped in the
that functioned in one capacity become modified as they tale on new functions. The
anatomy supports that evolution is a remodeling process in which ancestral structures
modification. For example, the same skeletal elements make up the forelimbs of
ancestor. The amis, wings, lippers, and forelegs of different mammals are variations
on a common anatomical theme that has been modified for divergent functions.
very different functions.
lower parts of a lowering plant are homologous. They are considered to have evolved
The basic similarity of these forelimbs is the consequence of mammals from a common
Similarity in characteristics resulting from common ancestry is known as homology,
human, cats, whales, bats, and all other mammals, although these appendages have
same taxonomic category bring another support to the theory of the Descent with and such anatomical signs of evolution are called homologous structures. Comparative from leaves, to form sepals, petals, stamens and carpels The oldest homologous structures are vestigial organs, rudimentary structures of pelvis and leg bones of walking ancestors,vermiform appendix in carnivores, presently. For instance, the skeletons of whales and some snakes retain vestiges of the
marginal, if any, use to the organism. Vestigial organs are historical remnants of
structures that had important functions in ancestors but are no longer essential ear muscles in man etc.


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