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Hybrid sterility can be regarded as yet another form of interspecific sterility. The offspring of the interspecific crosses are mainly sterile. Geological studies have shown that the chromosomes of the hybrid individuals fail to synapse at the time of meiosis and thus result in either non-production of gametes or defective gametes. Unless the chromosomes of parents are accurately separated which might result in viable gametes,, in most cases the gametes are not produced and if produced they may not be fertile. The commonly cited example is the mule, a sterile animal the product of a cross between a donkey and a horse. Further, the hybrid species in general are found to have grossly abnormal reproductive system. If normal reproductive system is present, then meiosis is abnormal and non-viable gametes are produced. Thus various types of reproductive isolating mechanisms are at work in different groups of organisms to maintain the distinctness and uniqueness of species.
Which of the two forms of respiration (aerobic and anaerobic) gives more energy from a given quantity of food? Aerobic respiration gives more energy than anaerobic respiration
Polymerase chain reaction already has extremely widespread applications and new uses are being devised on a regular basis. Some and definitely not all of the applications are given
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Monoclonal Antibody is an antibody with quite specific and often unique binding specificity which is secreted by the biologically cloned line of plasmacytoma cells in the absence
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what is surrogate motherhood
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What is the relation among fecundation and the end of the meiotic process during oogenesis? The oocyte II only completes the second meiotic division (interrupted at metaphase) i
A triglyceride TG, TAG, triacylglycerol or triacylglyceride is an ester derivative from glycerol and three fatty acids. There are various triglycerides: depending on the oil source
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