Tag Archives | Evolution

Mechanisms of Reproductive Isolating | Evolution | Biology

A reproductive isolating mechanism is a structural, functional, or behavioural characteristic that prevents successful reproduction from occurring between different species. This helps in accumulating genetic variations in species. If reproductive isolation does not exist, variant forms freely interbreed with the normal forms and this would lead to intermixing of their genotypes. These mechanisms are of two types: 1. Pre-Mating Mechanisms: [...]

By |2017-08-09T19:42:35+00:00August 9, 2017|Reproductive Isolating|Comments Off on Mechanisms of Reproductive Isolating | Evolution | Biology
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Darwinism Theory of Evolution (With Criticism) | Biology

In this article we will discuss about the Darwinism theory of evolution with its criticism. In 1831, Charles Darwin on a voyage on HMS Beagle for five years noted the flora, fauna and geology of the islands of the South Pacific and collected numerous living and fossil specimens. He also sailed to the Galapagos Islands about 600 miles from the [...]

By |2017-08-09T19:42:35+00:00August 9, 2017|Darwinism Theory of Evolution|Comments Off on Darwinism Theory of Evolution (With Criticism) | Biology
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Evolution of Stele | Plants

In this article we will discuss about the evolution of stele in a plant. Stele (= Greek word meaning a column) can be defined as the unit of vascular system that is made up of xylem, phloem, interfascicular tissues, medullary rays, pericycle and pith (if present). The term stele refers to the central core of plant axis and is restricted [...]

By |2016-12-12T06:55:50+00:00December 12, 2016|Plant Anatomy|Comments Off on Evolution of Stele | Plants
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