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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.
In Drosophila, these genes occur on chromosome 4. H - wild type (normal) h - hairy F - wild type f - frizzled E - wild type e - vest
Where in mitochondria does the process called respiratory chain happen? Which are the products of the Krebs cycle used in that final phase of the aerobic respiration? Respirat
Why is the AIDS treatment often done with a drug cocktail? The treatment of acquired immune deficiency syndrome is often done with one or more anti-retroviral drugs of dissimil
Consumers - Biotic Components These are also called as phagotrophs or heterotrophs. The organisms grouped under this category cannot manufacture their own food but obtain the
Doppler echocardiogaphy is based on the Doppler effect, which was described by the Austrian phy$icist Christian Doppler in 1842. The Doppler effect states that sound frequency
Processing Methods for Amelioration of Anti-Nutritional Meals from many oil seeds often contain undesirable toxic and allergenic compounds that can reduce their nutritive valu
What is Metallic implants Metallic implants undergo one or more several surface modifications to enable them to become suitable for implantation. These modifications are passiv
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Q. Rules of Nomenclature classification? The Rules of Nomenclature prescribed the categories into which plants should be classified. These categories constitute the units of cl
Precautions for Morphological Characteristics of Yeast Cells? 1. Observe aseptic conditions. 2. Use only a small sample for staining. 3. No air bubbles should be in the s
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