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  2. One gene–one enzyme hypothesis - Wikipedia

    en.wikipedia.org/wiki/One_gene–one_enzyme...

    However, the proposed connection between a single gene and a single protein enzyme outlived the protein theory of gene structure. In a 1948 paper, Norman Horowitz named the concept the "one gene–one enzyme hypothesis". [2] Although influential, the one gene–one enzyme hypothesis was not unchallenged.

  3. Lemon - Wikipedia

    en.wikipedia.org/wiki/Lemon

    The lemon, like many other cultivated Citrus species, is a hybrid, in its case of the citron and the bitter orange. [5] [6] The lemon is a hybrid of the citron and the bitter orange. [6] Taxonomic illustration by Franz Eugen Köhler, 1897 . Lemons were most likely first grown in northeast India. [7] The origin of the word lemon may be Middle ...

  4. Citrus taxonomy - Wikipedia

    en.wikipedia.org/wiki/Citrus_taxonomy

    Initially, many citrus types were identified and named by individual taxonomists, resulting in a large number of identified species: 870 by a 1969 count. [18] Some order was brought to citrus taxonomy by two unified classification schemes, those of Chōzaburō Tanaka and Walter Tennyson Swingle, that can be viewed as extreme alternative visions of the genus.

  5. Plant genetics - Wikipedia

    en.wikipedia.org/wiki/Plant_genetics

    An image of multiple chromosomes, taken from many cells. Plant genetics is the study of genes, genetic variation, and heredity specifically in plants. [1] [2] It is generally considered a field of biology and botany, but intersects frequently with many other life sciences and is strongly linked with the study of information systems.

  6. Introduction to genetics - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_genetics

    The information within a particular gene is not always exactly the same between one organism and another, so different copies of a gene do not always give exactly the same instructions. Each unique form of a single gene is called an allele. As an example, one allele for the gene for hair color could instruct the body to produce much pigment ...

  7. Homology (biology) - Wikipedia

    en.wikipedia.org/wiki/Homology_(biology)

    Homologous sequences are paralogous if they were created by a duplication event within the genome. For gene duplication events, if a gene in an organism is duplicated, the two copies are paralogous. They can shape the structure of whole genomes and thus explain genome evolution to a large extent.

  8. WHERE ARE THEY NOW: All 165 cast members in 'Saturday ... - AOL

    www.aol.com/where-now-165-cast-members-173754111...

    The 50th season of "SNL" premiered last month. Since the first show in 1975, 165 comedians and actors have been a part of "SNL.". Three new comedians joined for season 50. "Saturday Night Live" is ...

  9. Human genetics - Wikipedia

    en.wikipedia.org/wiki/Human_genetics

    The human genome is the total collection of genes in a human being contained in the human chromosome, composed of over three billion nucleotides. [2] In April 2003, the Human Genome Project was able to sequence all the DNA in the human genome, and to discover that the human genome was composed of around 20,000 protein coding genes.