Controlling advance and development
All beef in the anatomy arise from the zygote. The zygote divides to anatomy a brawl of beef that activate to specialise.
Each of a person’s beef holds a archetype of all their genes. Although all anatomy beef in an animal accommodate the aforementioned genes, abounding genes in a accurate corpuscle may be ‘switched off’ (be fabricated inactive) as the corpuscle alone produces the specific proteins it requires.
In an embryo, beef are unspecialised up to the eight-cell stage, with all genes in the beef switched on. Corpuscle specialisation will action as the antecedent develops, with altered genes switching off in altered cells.
In the afterward diagram, a white aboveboard represents a gene switched on, a red aboveboard represents a gene switched off:
An unspecialised corpuscle – all genes switched on.
A specialised corpuscle eg a salivary gland corpuscle – some genes switched off.
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