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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.
what is the xternal & internal respiration in frog
tertiary structure of protein
Q. Show Clinical symptoms of galactosemia? Clinical symptoms of galactosemia deficiency is found to appear early in infancy. Some infants are born with cataract, jaundice and
A flashlight with a 6-volt bulb draws 2 amps from its batteries. What is the resistance of its circuitry?
Define Sample Preparation for Haemoglobin Content in Blood Wipe the index finger or middle finger with a cotton swab soaked in spirit. Prick the finger with a lancet op
Oxygen Dissociation Curves The oxygen content of blood fully saturated or oxygenated can be calculated. It is known as the oxygen capacity of blood and this varies for differe
Define Male and Female Ascaris Lumbricoides? Ascaris lumbricoides unlike most free-living nematodes and a large number of parasites of plants and animals are not tiny or micro
Define Applications of Isolated Soybean Proteins in Meat products? The major application of ISP in connection with meat and related products is based on the use of texturized I
The dangers of working in labs with animals will be minimised if the following precautions are taken: 1. Wash all dissection instruments in disinfectant after use. 2. Never
Theca - body form Protozoans It is a close-fitting hard structure around the plasma membrane, mainly composed of cellulose. It can be compared with the ceil wall of a plant ce
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