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In certain instances differences in the morphology of genitalia between species make it impossible for normal mating to occur, and sympatric species tend to remain isolated. When there is no correspondence between the male and female external genitalia for copulation to occur, the members belonging to different species are reprod;ctively isolated. When interspecific crosses occur between individuals having no exact correspondence in their genitalia, it resulted in the death of copulating pairs. Isects and snails are usually quoted as examples of such fatal ratings which occur "due to mechanical differences in their genitalia. It must alao be stated that differences in cogulatory organs, in many instances, have not proved to be a barrier for ihterbreeding. Breeding between dogs belonging to different races is an often cited example.
Mechanical isolation appears to play a more important role in the speciation of plants. Since many plants are aided by insects and birds in cross pollination, a morphological compatibility is required between the plants and the pollinating agents. Further, queen bees with their long mouth parts pollinate the nector producing species of Pedicularis and the other species of the plants are pollinated sternotribically or nototribically.
Explain Precautions for Estimation of Sucrose by Fehling Soxhlet Method? 1. Maintain proper temperature of the water bath for complete hydrolysis. 2. Add distilled water to
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Phylum Arthropoda : (8,00,000 to 10,00,000 species) They are known as 'jointed footed' animals. The appendages are paired, and jointed with chitinous exoskeleton, varied and wi
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Define effect of Caffeine on athletes? Caffeine is found in coffee, tea, colas and chocolates. Its doses at 3- 6 mg/d have been known to increase muscle contractility and aerob
Explain about the duration of exercise for diabetics patient After selecting an exercise, it is very important to know the vigorous nature, duration and timings of the exercise
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