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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.
Classification of lipids A general classification of lipids based on their structural components is presented in table. Such a classification, however, is possibly too rigid f
Do all mammals have a placenta? Mammals of the monotreme group (echidnas, platypus,) are oviparous, egg-laying, and they do not have a placenta. Mammals of the marsupial group
Are the extraembryonic membranes the same in all vertebrates? The presence of each extraembryonic membrane varies according to the vertebrate class. In fishes and amphibians
how dissect the dog fish
Anthrax Synonym : Wool sorter’s disease Species affected : Cattle, sheep, goats, pig, horse and majority of the mammals. Fowls are resistant to anthr
What is the mode of nutrition in fish,human,amoeba,scorpian & toad ?
Simultaneously with the formation of two daughter nuclei, a cleavage furrow appears in the middle of the cell. The furrows gradually deepen and divide the cell into two daughter ce
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Dietitians and nutritionists Dietitians and nutritionists, who are associated with hospitals and clinics generally have regular work hours. At times, they may be required to wo
Q. Describe Shunts? Detection, localization and quantification of intracardiac shunts are one of the most important exercises in cardiac catheterization. In most cases a prelim
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