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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.
Define Planning for nutritional need For Adults? The term 'adult' refers to any individual in the age group of twenty years and above. The period beginning from twenty years an
Colonial Theory - Metazoa This is the most popular theory on the origin of Metazoa. The idea was conceived by Haeckel (1874) modified by Metschnikoff (1886) and revived by Hy
Q. Nutritional management for diarrhoea? The conservative concept of treatment for diarrhoea was not in favour of feeding adequate amount of food. However, with the identificat
Chloroplasts Like mitochondria, chloroplasts are also distinctive organelles of eucaryotic cell. But they are found only in plant cells. Chloroplasts contain membranes forming
Define Historical example for Dynamical Network? John Tyson constructed a nonlinear differential equation model representing the majority of the network of biochemical pathways
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difference between axon and cyton
TRACHE A - It is a thin walled tube. Situated on ventral side. Commonly known as wind pipe. Supported by C-shaped cartilagenous rings. Incomplete dorsally due to oesopha
WALL OF EYE BALL - Outer to inner 3 layers present. 1. Sclerotic or fibrous Tunic 2. Choroid or uvea or vescular Tunic. 3. Retina or neuro sensory tunic. Sclerotic
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