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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.
Match each item in Column A with the corresponding item in Column B regarding infectious diseases Column A Column B a. Pulmonary tuberculosis i. Enteric infectious protozoan diseas
Rituals: The social life of the earliest human groups or tribes revolved around food gathering. To begin with, they must have collected anything they could eat-seeds, nuts, f
What are the subkingdoms into which the plant kingdom is divided? The kingdom Plantae is separated into two big subkingdoms: the bryophytes and the tracheophytes (pteridophytes
CHORIONI C VILLUS SAMPLING (CVS) - CVS is done during 8th-10th week of pregnancy when abortion is safe. For CVS cells are sucked into a catheter passed through the cervix.
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Over the past decade, the conceptual understanding of heart failure has changed significantly. Several large clinical trials have demonstrated that non-pharmacological and pharmaco
Explain the term of measurement of height in veous pressure? Measurement of Height: Measurement of height of venous pressure is done from the sternal angle of Louis verticall
Several TCA cycle intermediates can be used as a substrate for the synthesis of other compounds. Succinyl CoA is on intermediate that is directly used for the synthesis of which of
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