Genetics
  • Gregor Johann Mendel November 30, 2014

    Gregor Mendel Biography Gregor Johann Mendel (1822-84) was born to a ...

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  • Pleiotropy March 16, 2012

    In general, one gene affects a single character. But many genes are known to affect more than one character. Such genes are called pleiotropic genes and the condition is called Pleiotropy. An example of a gene in human beings ...

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  • Modified dihybrid ratios with codominant March 15, 2012

    The classical phenotypic ratio resulting from the mating of dihybrid genotypes is 9:3:3:1. This ratio appears whenever the alleles at both loci display dominant and recessive relationships. The classical dihybrid ratio may be modified if one or both ...

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  • Mendel's Hypothesis March 14, 2012

    Mendel studied the pattern of inheritance using several true-breeding varieties of garden peas. He concentrated on transmission of seven easily identified traits, and crossed plants showing alternate aspects of each of these(e.g., tallness and dwarfness; ...

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  • Rieger Syndrome March 11, 2012

    Definition Rieger syndrome is a rare disorder characterized by absence and/or malformation of certain teeth, mild craniofacial (relating to the head and the face) abnormalities, and various eye abnormalities. The eye abnormalities, referred to as Rieger eye malformations, may be ...

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  • Lethal Genes March 10, 2012

    The term ‘lethal’ in genetics is applied to those changes in the genome of an organism that produces effects severe enough to cause death. The fully dominant lethal alleleĀ  kills the individual both in ...

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