Nitrogen fixation is the process by which nitrogen is taken from its relatively inert molecular form (N2) in the atmosphere and converted into nitrogen compounds useful for other chemical processes (such as, notably, ammonia, nitrate and nitrogen dioxide).
Nitrogen fixation is performed naturally by certain types of anaerobic bacteria. Legumes such as clover contain symbiotic bacteria of this type within nodules in their root systems, producing nitrogen compounds that help to fertilize the soil. See George Washington Carver.
Nitrogen can also be artificially fixed for use as fertilizer or in other industrial processes. The most popular method is by the Haber process. Artificial fertilizer production has achieved such scale that it is now the largest source of fixed nitrogen in the Earth's ecosystem.
(This is the definition from the http://encyclopedia.kids.net.au/page/ni/Nitrogen_fixation website)
The correct answer is; <span>You conduct a dihybrid cross. a 12:1:1:4 ratio would make you suspect that the genes are linked. This is the expected phenotypic ratio for the dihybrid cross that would cause the genetic linkage i.e. formation of DNA sequences during the process of sexual reproduction. </span>
25% display the just one trait : 50% display the co-dominant trait : 25% display the just the other trait
For example: a cross of a pink flower and and another pink flower where white and red are co-dominant
25% white : 50% pink : 25% red
