Final answer:
Physical and some personality traits in organisms are determined by genes.
Step-by-step explanation:
In organisms, all physical traits and some personality traits are determined by genes.
Genes are specific segments of DNA that carry the instructions for producing proteins, which ultimately determine an organism's traits. These genes are inherited from an organism's parents and are located on chromosomes.
Genetic traits can also be influenced by other factors such as the environment and temperature, but genes play a crucial role in determining an organism's characteristics.