Shell color in crabs is determined by a polygenic inheritance system, possibly involving involving as many as 9 genes. For simplicity let’s consider the influence of 3 genes: A, B and C, where a dominant allele darkens shell color .

Crab A: BaABC

Crab D: Baaa

Crab B: BaCaaa

Crab C:

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you

The answer is nucleic acid 

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