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In the previous section we discussed the concept of species in detail and concluded that the concept of biological species and Mayr's definition of species have a wide acceptance among biologists. In this section we shall proceed to discuss the mechanisms of speciation or the mode of formation of a species. Mayr's definition of species amply makes it clear that to qualify for the title of the species, the individuals must be reproductively isolated from other groups. This naturally raises a question whether a new species could arise from populations occupying the same territory. In other words, should the populations of parent species live in quite separate territories in the formation of new species? In our earlier discussions. on natural selection, you have learnt that originmof adaptations is a gradual process, This is much more true of speciation. Biologists recognise three different kinds of speciation.
Explain Cyanotic Heart Disease breifly? Presence of cyanosis means deoxygenated blood reaching the systemic circulation bypassing the lungs i.e., right to left shunt. Uniform c
Q. What are the main biological functions of water? Ans. Water is the basic solvent for chemical reactions of living beings; it is the main means of substance transportati
DEFINITIONS E mbryology - Study of embryo is called as embryology. Zygote to emrbyo in uterus Developmental biology - Study of pre natal period & post natal period
Uterine infections Uterine bacterial contamination compromises uterine functions. Initially, the uterus is contaminated with a wide range of bacteria, but this is not consiste
modes of nutrition in rat
Considering a pair of homologous chromosomes containing a gene having two different alleles how many different genotypes can the individual present?
What are the specialized structures that help the adhesion between cells? The structures responsible for the union of the epithelial cells are known as cell junctions. The main
Niacin affects all lipid parameters favorably. It is one of the only agents that reduces Lp (a) significantly (up to 30 per cent). Unfortunately, compliance is poor because of freq
FEMALE REPRODUCTIVE SYSTEM - In female mammals the female reproductive system characteristically comprises of the ovary, uterus, placenta, vagina and vulva.
Define the Utilization of Most Probable Number Techniques? The MPN technique (multiple tube technique) can be used to determine the presumptive coliform count in the food. The
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