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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 BONE - On the basis of its texture , a bone is of two types - Spongy or cancellous or tubercular bone and Compact or periosteal or dense bone.
Define biomaterial and an implant and state their role in general Biomaterial : A pharmacologically inert material that is capable of interacting with a living organism witho
Q. Concerning their size and basic morphology how and why do the male and the female gametes differentiate from each other? The female gametes are big cells full of vitellus (n
Q. Show Appearance of food product? Appearance can be judged by the eye. Appearance factors include such things as size, colour, uniformity, absence of any defect, shape, whole
Define Trauma - Nutrition During Stress? The term "trauma" conies from a Greek word which means "a wound" (and or damage or defect). Trauma is a form of shock to the human body
Define respiration in animals
Inportant step for gene clonning
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Contagious bovine pleuropneumonia (CBPP) This is a highly fatal disease of cattle and of major economic importance in certain tropical countries. It also affects buffaloes, bis
what protist changes shape constantly and flows around its food to engulf it?
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