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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.
The Features of Retrograde Peri-Implantitis include: - Periapical Bone loss without gingival inflammation. - Microflora consisting mainly of streptococci and nonmotile organ
Explain the Nutrition of Fungi? Fungi grow in moist environment and are chemoorganoheterotrophs. What do we mean by chemoorganoheterotrophs? The term chemotroph describes organ
significant role of suicide cells?
Respiration It is important that you comprehend the main points because they ate essential for your understanding of respiratory physiology. To enter or leave the body, oxygen
Q. What is Galactosemia? Galactosemia is a genetic disorder caused by deficient functioning of any of these three enzymes namely galactokinase, galactose -1 - phosphate uridyl
Renal parenchymal disease is the commonest cause of secondary hypertension. Hypertensive and diabetic nephropathy and chronic glomerulonephritis are the main causes. Eventually, t
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What are the cells that produce the myelin sheath? Of which substance is the myelin sheath formed? In the central nervous system (CNS) the myelin sheath is made by apposition o
what is the biological significance of skeleton
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