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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.
LIVING FOSSILS - 1. Limulus (King crab) Arthropoda 2 . Neopelina Mollusca 3 .
Q. Role of Exercise and Drugs in management of diabetes? Aerobic exercise for at least 20-30 minutes four or more times a week is recommended. Exercise after meals is preferre
What is the neurotransmitter of the neuromuscular junction? How does the nervous system trigger muscle contraction? The nervous cells that trigger the muscle contraction are th
Neurosecretory Cells and Neurosecretion We have before said that the neurosecretory cells are an important component of the non- chordate endocrine system. Of course, they are
#questionwhy is urea the major nitrogenous excretory product..
Describe about the stomach
Anthrax Synonym : Wool sorter’s disease Species affected : Cattle, sheep, goats, pig, horse and majority of the mammals. Fowls are resistant to anthr
Molecular Biology Transgenesis: pro-nuclear injection of isolated gene into fertilised egg cell, cell divides to form embryo, then embryo implanted into surrogate.
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Cancer Lung Incidence of cancer lung is more in persons who smoke. Environmental and industrial pollution is also a risk factor in the increase in incidence. Clinic
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