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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.
Single Cell Proteins (SCP) The term SCP was coined by Prof. Caroll Wilson (MIT) in 1966. It means the proteins obtained from microbial sources, i.e. algae, fungi, bacteria,
Q. Photosynthesis is the most significant producer of molecular oxygen (O2) on our planet. From which molecule do oxygen atoms liberated by photosynthesis come and from which other
Explain The proteins stabilize emulsions The proteins stabilize emulsions and contribute physical and rheological properties, like thickness, viscosity, elasticity and r
What type of metamorphosis do spongs go through is it reteogressive?
Name the one autosomal dominant and autosomal recessive Mendel an disorder in Humans. a) How is the action of exonucluease dissimilar from that of end nuclease? b) India has
what is skeleton?
ESR and CRP are elevated in almost all patients of arthritis and carditis and rarely in patients with chorea. ESR should be repeated periodically as it is useful in following the c
Occlusal load affect Osseointegration The timing and amount of overload are critical for osseointegration. Occlusal loading early, where the primary stability is low leads to h
P A TTERN OF GROWTH - 1 . ISOMETRIC - In it an organ grows at the same rate as the rest of body. External form of body is not changed. eg. fish, locust. 2 .
definition of dietary factors. or what are dietary factors?
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