The true breeding organisms are ______________.
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homozygous
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heterozygous
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nullizygous
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hemizygous
A
Correct answer
Explanation
A cell is said to be homozygous for a particular gene when identical alleles of the gene are present on both homologous chromosomes. The cell or organism in question is called a homozygote. True breeding organisms are always homozygous for the traits that are to be held constant.