In this article we will discuss about the mechanisms that decrease and increase genetic variation. Mechanisms that Decrease Genetic Variation: i. Natural Selection: Some types of organisms within a population leave more offspring than others. Over time, the frequency of the more prolific type will increase. The difference in reproductive capability is called natural selection. Natural selection is the only [...]
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? [...]