Question

genes are segments of dna that are the basic unit of heredity. they are passed on from parent to offspring.
the gene form of a trait is called a(n) allele
an organisms allele combination is called the genotype
the physical appearance of an organism is called the
done
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Explanation:

The question is about genetics terminology. The physical appearance of an organism is a key concept in genetics. Among the given options, "phenotype" is the term defined as the physical appearance of an organism.

Answer:

phenotype