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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.
Q. What are the factors that for influencing photosynthesis also interfere with the gross primary productivity? Mostly light and water, but as well mineral salts, carbon dioxid
The basic parts of RNA are the same than for DNA with two major differences. The pyrimidyne base uracil exchange thymine and ribose replace deoxyribose see the sugar, pyrimidines a
Explain about the Protein-Energy Ratio (NDP Cal%)? Platt and his colleagues (1961) are largely responsible for the introduction of the ratio of protein energy to total energy (
Permanent Wilting Percentage (PWP) It is the percentage of moisture in the soil at which a plant wilts and does not recover unless water is added to the soil. PWP for clay is
parasitic adaptations
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Q. What is the function of the left ventricle? Where does the blood go after leaving the left ventricle? The function of the left ventricle is to pump the blood under high pres
Explain Micropener - Non-surgical Endodontic Retreatment They are iso-colour coded flexible, StSt hand instruments It has with 7mm k-type flutes, It is ava
Explain about the Blanching - Food Processing? Blanching is used for variety of purposes. It is defined as a mild heat treatment applied to tissue (usually plant) prior to free
Normal nutrition: a base of therapeutic diet Normal nutrition is the foundation upon which the therapeutic modifications are based. The primary principle of diet nutrition the
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