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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.
Enzymes and recombinant DNA technology Recombinant DNA technology, also called as genetic engineering makes use of a variety of enzymes, particularly restriction endonucleases
What is ascaris? What is the disease caused by this worm? Ascaris, or Ascaris lumbricoides, is an animal of the nematode phylum, i.e., a roundworm. Ascaris causes ascariasis, a
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Rectum check for anal patency and passage of meconium and observe whether meconium is passed or not. Confirm its patency then pass a catheter or gloved finger check if
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How many chambers do the bird heart and the mammalian heart have? Concerning temperature maintenance what is the advantage of the double and complete circulation of these animals?
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How to increase in the amount of glucokinase in liver Consumption of a meal rich in carbohydrate or administration of insulin initiate an increase in the amount of glucokin
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