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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.
TYPE S OF NEURONS - The neurons are classified on the basis of their structure and function. (A) On the basis of the structure, the neurons are of four types.
Exercises and ambulation Continue taking all exercises taught in the hospital. Steam inhalation may be continued. Walk on levelled space first, gradually increase the dista
Q. Dietary Recommendations during Diarrhoea? The diet should take into account the normal RDI and various adjustments made to the quantity and quality of the foods to be given.
Disposal : Opaque bags are the recommended for disposing off carcasses. You should also put freshly dissected animals and tissues into opaque plastic bags, seal them and dispose t
Define the Calcium Toxicity? Elevated blood calcium can occur in association with high parathyroid hormone, hyper- or hypothyroid conditions, bone metastasis, vitamin D toxicit
What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)? Platyhelminthes are also called as flatworms because they are
What is the relation between the concepts of chromatin and chromosome? Are euchromatin and heterochromatin part of chromosomes? Every filament of chromatin is a complete DNA mo
1 ." Most of the genome does not code for protein, therefore 99% of the human genome is junk that serves no purpose". With specific reference to examples long and short non-coding
Liver necrosis?
Explain the True indications of Endodontic Surgery 1. Failure of non-surgical endo. Re-treatment "persistent lesion" 2. Failure of initial and retreatment will not achieve b
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