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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.
What is crossing over? How is meiosis related to this phenomenon? The Linked alleles for instance, A-b and a- B form the gametes A-b and a-B that maintain the linkage of the al
which system give the signals to salivary gland
Liver function test should be done for all diabetic patients. This will help the doctor in the choice of drugs for the treatment of diabetes since liver abnormalities influence the
What are the differences and similarities between the bacterial and eukaryotic cell membranes?
Explain the Importance of nicotinic acid Nicotinic acid is successfully used in the therapy of a number of vascular disorders such as vascular spasms, angina pectoris, arthriti
To get the idea on the process capability that whether the intended process provides the consistent results or not(precision).
Protonephridia and Metanephridia Nephridia take place in two major forms - the protonephridium and metanephridium. Protonephridia are found in flat worms. The protonephridial
Nature of Light - Floral Induction Red light promotes flowering in short day plants. If the dark regime of a short day plant is interrupted by red light, flowering is inhibite
Define Transverse section of body of male Ascaris? 1. Body wall consists of the following: (a) Cuticle is the outermost layer. It is a thick, tough, elastic membrane
How to load glycogen? Over the past fifty years, the biggest breakthrough was the discovery of how to load glycogen and sophistication in the methods of glycogen loading. Nitro
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