enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Disassortative mating - Wikipedia

    en.wikipedia.org/wiki/Disassortative_mating

    Imprinting is one example of disassortative mating. A model shows that individuals imprint on a genetically transmitted trait during early ontogeny and choosy females later use those parental images as a basis of mate choice. A viability-reducing trait may be maintained even without the fertility cost of same-type matings. [5]

  3. Mendelian traits in humans - Wikipedia

    en.wikipedia.org/wiki/Mendelian_traits_in_humans

    Therefore no trait is purely Mendelian, but many traits are almost entirely Mendelian, including canonical examples, such as those listed below. Purely Mendelian traits are a minority of all traits, since most phenotypic traits exhibit incomplete dominance , codominance , and contributions from many genes .

  4. Underdominance - Wikipedia

    en.wikipedia.org/wiki/Underdominance

    In genetics, underdominance, also known as homozygote advantage, heterozygote disadvantage, or negative overdominance," [1] is the opposite of overdominance. It is the selection against the heterozygote , causing disruptive selection [ 2 ] and divergent genotypes .

  5. Disruptive selection - Wikipedia

    en.wikipedia.org/wiki/Disruptive_selection

    As a consequence of this type of selective pressure, our hypothetical rabbit population would be disruptively selected for extreme values of the fur colour trait: white or black, but not grey. This is an example of underdominance (heterozygote disadvantage) leading to disruptive selection.

  6. Zygosity - Wikipedia

    en.wikipedia.org/wiki/Zygosity

    Alternatively, a heterozygote for gene "R" is assumed to be "Rr". The uppercase letter is usually written first. [citation needed] If the trait in question is determined by simple (complete) dominance, a heterozygote will express only the trait coded by the dominant allele, and the trait coded by the recessive allele will not be present.

  7. Heterozygote advantage - Wikipedia

    en.wikipedia.org/wiki/Heterozygote_advantage

    A heterozygote advantage describes the case in which the heterozygous genotype has a higher relative fitness than either the homozygous dominant or homozygous recessive genotype. Loci exhibiting heterozygote advantage are a small minority of loci. [1] The specific case of heterozygote advantage due to a single locus is known as overdominance.

  8. Balancing selection - Wikipedia

    en.wikipedia.org/wiki/Balancing_selection

    However, these heterozygote individuals, known as carriers of the sickle cell trait, may suffer problems from time to time. The heterozygote is resistant to the malarial parasite which kills a large number of people each year. This is an example of balancing selection between the fierce selection against homozygous sickle-cell sufferers, and ...

  9. Test cross - Wikipedia

    en.wikipedia.org/wiki/Test_cross

    The first uses of test crosses were in Gregor Mendel’s experiments in plant hybridization.While studying the inheritance of dominant and recessive traits in pea plants, he explains that the “signification” (now termed zygosity) of an individual for a dominant trait is determined by the expression patterns of the following generation.