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 .
There are two types of alleles. An allele that masks another is the allele. The one that is masked is called the allele.An organism that has the same alleles for a particular trait is . An organism that has different alleles for a particular trait is .
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