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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.
Indications for Emergency Surgery in AR 1) Post balloon valvotomy AR with haemodynamic compromise 2) Acute thrombosis of prosthetic valve, not responding to thrombolysis
Q. Which are the vessels that drain filtered blood from the kidneys? The renal veins carry the blood that has been reabsorbed in the nephron tubules and the venous vessels that
Explain the systemic antibiotic cover The need for systemic antibiotic cover should be considered. The original protocols recommended an antibiotic such as amoxicillin 250 mg
After leaving the end of a ski ramp, a ski jumper lands downhill at a point that is displaced 66.2 m horizontally from the end of the ramp. His velocity, just before landing, is 18
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Explain the Chemical Properties of Monosaccharides? As you already know the chemical properties of monosaccharides depend on the presence of the hydroxyl the aldehyde or the ke
Define about the Composition of Body Weight? You might have read in previous units that our body weight is composed of muscle bone and fat. Segregating these components of body
Q. What is transgenic food? The Transgenic beings are animals, microorganisms and plants that contain recombinant DNA that is genes from other microorganisms, plants or animals
economic importance of mulluscas
function of topoisomerace?
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