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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.
Using high temperature carbonization, metallurgical coke (hard coke) can be prepared by two processes. 1. Beehive coke oven process. 2. Otto-hoffmann's by-product
Q. How does the breathing process correct acidosis? The increment of the respiratory frequency makes the body eliminate more carbon dioxide and to shift the equilibrium of the
Where do the light reactions occur in prokaryotic and eukaryotic cells?
in molluscathe foot is used for (capturing locomotion or both
By-Products from Sugar Industry India is one of the important sugarcane (Saccharum officinarum) growing countries of the world. Five main by-products are available from the su
why phloem made of living cells
NEO-LAMARCKISM Modem modified form of Lamarck theory is regarded as Neo-Lamarckism. Mc Dougall (1938) found that time taken for training the mice was reducing gradually
Access burs through the crown: Carbide fissure burs : cut through metal ( amalgam alloy or cast metal ) or composite resin. Porcelain fused to metal : -A round diam
Complete the sentence by choosing one of the given biological terms. If an ulcer continues and ultimately erodes all the way through the wall of stomach or duodenum, condition
While studying evolution, a student comes across a cladogram that includes clades like amphibia, reptilia, aves, and mammalia. What must be the basal clade?
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