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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.
D uck septicemia (duck pasteurellosis/new duck disease) The disease is caused by Pasteruella anatipestifer (Syn. Riemerella anatipestifer ) that mostly affects growing duck
Considering a pair of homologous chromosomes containing a gene having two different alleles how many different genotypes can the individual present? If a gene of a diploid spec
Freeze Fracture Electron Microscopy Freeze fracture electron microscopy i a technique lo reveal the surface features of hydrophobic interior of cell membrane. In this technique,
Q. What is the contraceptive mechanism of the IUD? The IUD (intrauterine device) is a piece of plastic coated with copper that is put-in within the uterus by a doctor. Coppe
Sterility in Angiosperms Sterility in angiosperms may arise due to several causes. Either the anther may not be formed, or anthers are formed but meiosis may be abnormal. A
Ritonavir (RTV, Norvir) Ritonavir is well absorbed from the gastrointestinal tract and at full doses potently inhibits HIV, but due to poor tolerability it is now used mainly
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What is the mechanism described by Darwin that eliminates species less adapted to environmental conditions? The mentioned mechanism is the natural selection.
Plate Tectonic Is a Theory of Geology Which describes the large scale motion of earth's lithosphere. The theory builds on the older theory of continental drift from the first half
This problem refers to the MN and ABO loci mentioned in class. It also refers to the Rh locus, which is responsible for the positive/negative part of the blood type. The Rh+ allele
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