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  Section: Genetics » Lethality and Interaction of Genes
 
 
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Complementary genes

 
     
 
Content
Lethality and Interaction of Genes
Lethality
Interaction of genes
Abbreviated genotypic ratio
Two gene pairs affecting same character
Epistasis
Complementary genes
Duplicate genes
Additional interactions involving two gene pairs
Interactions between more than two gene pairs
Modifiers, suppressors and pleiotropic genes
Meiotic drive, segregation distortion and selfish genes
Penetrance and expressivity

A classical example of interaction of genes is the complementation between two genes meaning that both genes are necessary for the production of a particular phenotype. W. Bateson and R.C. Punnett observed that, when two white flowered varieties of sweet pea, Lathyrus odoratus were crossed, F1progeny had coloured flowers. When F2 progeny obtained from F1 was classified, plants with coloured flowers and those with white flowers were obtained in 9 : 7 ratio. This is again a modification of 9 : 3 : 3 : 1 ratio, where only one character i.e. flower colour is involved and only two classes recognized (coloured and white flowers). The abbreviated genotypic ratio given in Table 3.4 will explain the kind of interaction involved.

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It is obvious in the above example that both the dominant alleles, ‘C’ and ‘P’ are necessary for the production of pigment in the flowers. Each of the two parents lacks one of the two dominant alleles and, therefore, both bear only white flowers. The two dominants are brought together in F1 generation and therefore coloured flowers are produced.

 
     
 
 
     




     
 
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