(picture not licenced under creative commons) one of the larger species: pomacea haustrum . yellow-black apple snail (pomacea diffusa ). this colour variant lacks the dark brown colour of the shell , so the yellow base colour shines through. white, or albino variant of an apple snail (pomacea diffusa...
. only when both genes are switched off, the colour is absent in the snail (single-gene recessive). keep in mind that this is an example of how the inherit colour variations in these snails may work. select which genes should be active: resulting snail type gene for dark shell pigment on chromosome copy...
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