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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.
Rheumatic Fever and Rheumatic Heart Diseases Rheumatic fever is an inflammatory disease of the heart potentially involving all layers of the heart. The resulting damage to t
Some of the important food hydrocolloids are listed below: Alginate Carboxymethyl Cellulose Guar gum Gum Arabic Xanthan Gum Carrageenan All h
Classic Procedure: The approach is the same as described earlier for open mitral valvotomy. The excision starts with an anterior incision on the anterior leaflet at 12o'clock p
Prevention You as nurse needs to ensure that iron supplementation is given to children who are at risk for iron deficiency. Iron supplementation should start between 4 and
In this 1st step, the corresponding aminoacyl-tRNA for the second codon binds to the A site by codon-anticodon interaction. Binding of the aminoacyl-tRNA needs elon
Explain how a water molecule is produced when glucose and fructose undergo a condensation reaction. The glucose molecule releases a hydroxide ion, OH -, and the fructose molec
respiration through moist skin
Double helical structure of dna
What are mycorrhizas? How does each participant benefit in this ecological interaction? Mycorrhizas are mutualist ecological interactions among fungi and some plants roots. Fun
wine turns sour beause of the action of which bacteria? aerobic or anerobic?
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