Evolution is not progress. The popular notion that evolution can be represented as a series of improvements from simple cells, through more complex life forms, to humans (the pinnacle of evolution), can be traced to the concept of the scale of nature. This view is incorrect. All species have descended from a common ancestor. As time went on, different lineages [...]
The concept of biological species was advanced by Mayr (1957) and gained general acclaim through the advocacy of Stebbins, Clausen, Grant and others in botanical taxonomy. This concept underscores reproductive isolation which is, in turn, a by-product of genetic divergence. The biological species, according to Grant (1957), is defined as "a community of cross fertilising individuals linked together by bonds [...]
Everything you need to know about distant hybridization of plant species ! Q. 1. What is distant hybridization? Ans. Crossing between different species of the same genes or different genera of the same family is called distant hybridization; also known as wide crossing. It is of two types, viz. interspecific hybridization and intergeneric hybridization. Q. 2. What is interspecific hybridization? [...]