The gene form of a trait is called a(n). An organism’s allele combination is called the . The physical appearance of an organism is called the.

The gene form of a trait is called a(n) allele.

An organism’s allele combination is called the genotype.

The physical appearance of an organism is called the phenotype.

Explanation:

Genes are segments of DNA that are the basic unit of heredity. They are passed on from parent to offspring.

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explanation:

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a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.