A geneticist represents the phenotype of an individual with the alleles dd should be considered as the homo-zygous recessive.
In diploid organisms, an individual collected two gene forms or 'alleles' for the same gene locus.
An individual should be considered as the heterozygous at the time when collected two different alleles for the similar gene locus, whereas an individual should be homo-zygous when receives the same alleles for a gene locus.
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