The true statement about genes is: Genes determine traits by coding for proteins.
The other statements are false:
- Genes are not only found in animals; they are present in all living organisms, including plants, fungi, and microorganisms.
- Not all genes are identical in every organism; genes can vary significantly between different species and even among individuals of the same species.
- Genes can be passed from parents to offspring, which is a fundamental principle of genetics.