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Showing posts with the label Epistasis

Dunaliella salina - Overview

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                 Dunaliella salina Dunaliella salina is a unicellular microalgae belong to division Chlorophyta . It is found in salinity environments such as salted brines, salt evaporation ponds, and hypersaline lakes  .It is able to tolerate varying NaCl concentrations, ranging from 0.2% to approximately 35% . Thus, Dunaliella salina is a hyper-halotolerant organism found in high densities in saline lakes.  The ability to tolerate high salt concentrations is advantageous, since competition is minimal in high salt concentration areas.  How D.salina   tolerate high salt concentration? D. salina has adapted to survive in high salinity environments by accumulating glycerol to balance osmotic pressure. Note :  D. salina is also adapted to solar radiation using β-carotene to protect against ionizing energy.                 Red Colour of Salt Brines  Dunaliella salina...

Genic interactions

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link of basic terminology(part 1) Link of Mendel work(part2) link of genetics(part3) link of genetics(part4) Genic interactions : Effect of one allele(or gene) on the other allele(or gene) of the same or different gene pair.It have two types: *** Allelic   interaction :   The alleles of the same gene is interact in such a way that it produce a new character.Also called Intraallelic/  Intragenic interaction.E xamples: Complete dominance    :  3 :1 Codominance                 :  1:2:1 Incomplete dominance :  1:2:1 Link of all type of dominance *** Inter-allelic interaction :  Two or more genes interacts and affect the expression of each other.Also called intergenic/non-allelic interaction. Examples: All epistasis Supplementary genes:  9: 3: 4 Collabarative gene effect : 9: 3 : 3 : 1 Inhibitory gene    : 13 : 3 Polymeric gene   : 9 : 6 :1 ***Mendel monohybrid ra...