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Sympatric speciation can be regarded as speciation where parent species gives rise to a daughter species without the individuals of a species being separated by space or territory. Both instantaneous and gradual models of sympatric speciation have been proposed. Barring one mode of instantaneous speciation by a mechanism known as polyploidy, other modes of sympatric speciation have remained quite controversial. Polyploidy is quite common among plants. (For a detailed discussion on polyploidy refer to Unit 10 of Block 2 of LSE-03 of Genetics course). A cross between two diploid plants could result in a tetraploid hybrid. The hybrid would remain largely reproductively isolated from its diploid parents. The reason for such isolation is that due to back-crossing if a triploid individual were to be formed, it will produce a high proportion of nonviable gametes. There is also a possibility that interbreeding between deploid and tetraploid forms or between different tetraploids may give rise to other polyploids.
Q What are the different kinds of gas exchange that occur in animals? In beings from the kingdom Animalia the gas exchange may occur either by diffusion, cutaneous respiration,
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Define the term - lamellac The inner membrane is folded into very closely packed membranes called the lamellac. The lamellae flatten out at regular intervals into structures c
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modes of nutrition in rat
Gregor mendel was an austrain augustianian monk; his work most notably showed that. a. Alleles segregate during meosis b. Capital alleles are dominant c. The genetic material is pa
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Q. Illustrate Pulmonary Artery Enlargement? On the PA view, the pulmonary trunk is border forming for a short distance between the aortic knuckle and the left atrial appendage.
Define Precautions for Quantitative Determination of Viable Microbes? 1. Dilution should be made carefully. 2. Use fresh sterile pipette for making each dilution. 3. Asep
Examine the differences between DNA and RNA. Explain why DNA is the most favorable molecule for genetic material and how RNA compares to it in this respect.
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