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) . an organism’s allele combination is called the . the physical appearance of an organism is called the .

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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 organism’s allele combination is called the genotype.

The physical appearance of an organism is called the phenotype.

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