2. A multiple allelic series in dogs governs the distribution of coat-colour pigments. The allele
A, produces an even distribution of dark pigme
over the body; the allele A, reduces the intensit
of pigmentation and produces sable dogs, the
allele a produces spotted patterns. The
dominance hierarchy is A, >A2>a. Given the
following pedigree:​

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.