I. Introduction II. Host Specificity of Viruses III. General Features of Viral Replicative Cycles IV. Variations on Viral Replicative Cycles V. Conclusion

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Aneuploidy: Trisomy 21 (Down syndrome):  An extra copy of chromosome 21 results in intellectual disability and physical abnormalities such as a flattened facial profile and small ears. Turner syndrome:  A missing X chromosome in females results in short stature, webbed neck, and a lack of sexual development. Klinefelter syndrome:  An extra X chromosome in males…

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Introduction Aneuploidy  Aneuploidy is the presence of an abnormally large number of chromosomes in a cell. This can happen because of:  Nondisjunction: when chromosomes fail to split properly during meiosis, resulting in cells with an additional or missing chromosome. Trisomy 21 (Down syndrome) is one such condition caused by the existence of an extra copy…

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I. Introduction A. Definition : The chromosomal basis of sex refers to the genetic basis by which the sex of an individual is determined. It encompasses the chromosomes, genes and molecular mechanisms that are involved in the development of sexually dimorphic characteristics. B. Importance : Understanding the chromosomal basis of sex is important for a…

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