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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.
Regulation of Glycolysis There are three markedly exergonic reactions in the glycolytic pathway, which are considered physiologically irreversible. These reactions are cataly
The citric acid cycle also called as the TCA cycle (tricarboxylic acid cycle) and the Krebs cycle or the Szent-Györgyi-Krebs cycle is a series of chemical reactions used by all aer
How CPHs produce fermions? Answer- For understanding how CPHs is can produce fermions, do consider to electromagnetic, when the wavelength is growing. It's a CPH So CPH is a ti
Explain the Pathogens of forest insects? Caterpillars that defoliate forest trees have main economic impacts. Many such species go through periodic outbreaks. The forces which
Determine Health Hazards Associated with High Altitude? Abrupt exposure to altitudes greater than 10,000 ft (3050 in) elevation is frequently associated with symptoins of altit
Q. What is the basic importance of water for enzymatic activity? Ans. Biological catalysts, Enzymes, relay on water to reach their substrates and attach to them. There is
Medication The patient is advised to continue antibiotics for a week more after discharge. Other medications prescribed are analgesics (acetaminopen), cough syrup, diuretics
When the level of AMP is high, this shows the requirement for more ATP synthesis. AMP stimulates PFK increases the rate of glycolysis and inhibits fructose 1 and 6- bisphosphatase
I need help in pipeline processing in computer architecture.
Q. How long after ovulation must fecundation occur to be effective? If fecundation doesn't occur around 24 hours after ovulation the released ovum often dies.
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