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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.
Phenylketonuria is a severe form of mental retardation caused by a recessive allele. The condition affects about 1 in 25,000 newborn babies. In a population of 250,000 people, how
T ra n sge n i c animals There are various definitions for the term transgenic animal . The transgenic animal is an animal in which there has been a deliberate modifica
Q. Global alteration of brain functioning - Sleep? Sleep involves a global alteration of brain functioning, and occupies one third of our lives, The transition from waking to
Which of the vertebrate classes (a) are 'warm-blooded', (b) reproduce by laying eggs? (a) Birds and mammals are 'warm-blooded'. (b) Fish, Amphibia, Reptiles
Explain Inotropes and Vasopressors Persisting hemodynamic instability after correction of hypovolemia would necessitate the use of vasoactive agents. Which drug or interventio
Plants are the source of a large variety of biochemicals which are metabolites of both primary and secondary metabolism. But secondary metabolites are of much greater interest s
Vitamin B 6 (Pyridoxine hydrochloride) Pyridoxine hydrochloride is a white, crystalline powder, practically odourless. The dry substance is sufficiently stable in air. With pr
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Define the Principle behind Cyanmethemoglobin Method? The principle behind the cyanmethemoglobin method is as follow: Principle The haemoglobin is treated with a reagent con
Define Ion exchange chromatography? In this method a reversible exchange of ions is effected. Usually resins and ionic solutes are the two components involved in ion-exchange.
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