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- Bead_theory abstract "The bead theory is a disproved hypothesis that genes are arranged on the chromosome like beads on a necklace. According to this theory, the existence of a gene as a unit of inheritance is recognized through its mutant alleles. A mutant allele affects a single phenotypic character, maps to one chromosome locus, gives a mutant phenotype when paired and shows a Mendelian ratio when intercrossed. Several tenets of the bead theory are worth emphasizing :-1. The gene is viewed as a fundamental unit of structure, indivisible by crossing over. Crossing over take place between genes ( the beads in this model ) but never within them.2. The gene is viewed as the fundamental unit of change or mutation. It changes in toto from one allelic form into another; there are no smaller components within it that can change.3. The gene is viewed as the fundamental unit of function ( although the precise function of gene is not specified in this model ). Parts of a gene, if they exist cannot function.Seymour Benzer showed in the 1950s that the bead theory was not correct. He demonstrated that a gene can be defined as a unit of function. A gene can be subdivided into a linear array of sites that are mutable and that can be recombined. The smallest units of mutation and recombination are now known to be correlated with single nucleotide pairs.".
- Bead_theory wikiPageID "3700085".
- Bead_theory wikiPageLength "1813".
- Bead_theory wikiPageOutDegree "8".
- Bead_theory wikiPageRevisionID "475417338".
- Bead_theory wikiPageWikiLink Bead.
- Bead_theory wikiPageWikiLink Category:Genetics.
- Bead_theory wikiPageWikiLink Category:Obsolete_biological_theories.
- Bead_theory wikiPageWikiLink Chromosome.
- Bead_theory wikiPageWikiLink Gene.
- Bead_theory wikiPageWikiLink Hypothesis.
- Bead_theory wikiPageWikiLink Necklace.
- Bead_theory wikiPageWikiLink Seymour_Benzer.
- Bead_theory wikiPageWikiLinkText "Bead theory".
- Bead_theory hasPhotoCollection Bead_theory.
- Bead_theory wikiPageUsesTemplate Template:Cite_journal.
- Bead_theory wikiPageUsesTemplate Template:Genetics-stub.
- Bead_theory subject Category:Genetics.
- Bead_theory subject Category:Obsolete_biological_theories.
- Bead_theory hypernym Hypothesis.
- Bead_theory type Theory.
- Bead_theory comment "The bead theory is a disproved hypothesis that genes are arranged on the chromosome like beads on a necklace. According to this theory, the existence of a gene as a unit of inheritance is recognized through its mutant alleles. A mutant allele affects a single phenotypic character, maps to one chromosome locus, gives a mutant phenotype when paired and shows a Mendelian ratio when intercrossed. Several tenets of the bead theory are worth emphasizing :-1.".
- Bead_theory label "Bead theory".
- Bead_theory sameAs m.09w2_1.
- Bead_theory sameAs Q4876059.
- Bead_theory sameAs Q4876059.
- Bead_theory wasDerivedFrom Bead_theory?oldid=475417338.
- Bead_theory isPrimaryTopicOf Bead_theory.