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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.
Pathogenesis The mode of intracellular replication of chlamydial agents is investigated morphologically and cytochemically with both light and electron microscope. It is estab
Explain the Drug Effects on Absorption of Nutrients? Many drugs can impair, prevent or reduce absorption of nutrients due to: Formation of insoluble complexes: many drugs
Cholesterol, from stereos (solid) and the Greek chole- (bile) followed by the chemical suffix -ol for an alcohol is an organic chemical substance classified as a waxy steroid of fa
Assume that the smallest object your visual system can detect is 100 micrometers in size and you have a microscope with a 10x ocular lens. If you have an object that is 1 nanometer
What is the excretory organ of an agama lizard?
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Q. Is the cell division happening during the entire cell cycle? What is the interphase? Cell division properly occurs throughout the mitotic phase of the cell cycle. During int
Following ways can be used for control of noise pollution: It can be controlled by designing, fabricating and using quiter machines. In heavy industries, sound proof insul
1. In rabbits, black fur is dominant to brown, and long hair is dominant to short hair. A male is mated to several brown, short-haired females. These matings result in the followin
What is the main moral problem about the cloning of human individuals? As well biological perils, a very serious moral problem involves the nucleus transplantation technology c
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