Scientists can measure gene expression in firefly genes using plants. To measure the gene expression, the firefly gene must be attached to the plant
gene that scientists want to study. Then, when the plant gene is
actively expressing itself, such as when a new leaf forms, the firefly gene
simply lights up. The light can be detected and measured by a number of
devices. How is it possible that plants can express firefly genes?

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

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explanation:

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small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.