heterozygote

noun

Etymology: From hetero- + zygote. Coined by English biologists William Bateson and Edith Rebecca Saunders in 1902, in a paper titled "The facts of heredity in the light of Mendel’s discovery".

1. A diploid individual that has different alleles at one or more genetic loci.
2. A bacteriophage that has two different copies of its genetic material and so produces two types of offspring.