Agated channel in a cell membrane allows

osmosis
simple diffusion
active transport
facilitated diffusion

The answer to your question is:
Facilitated diffusion

Genetic chimeras, are organisms that carry more than one genetically distinct population of cells derived from more than one zygote.A genetic chimerism is a single organism composed of cells with distinct genotypes. In animals, it means an individual derived from different zygotes, which may include possessing both female and male sex organs, blood cells of two blood types, or subtle variations in form.