An alternative term to "homozygous" could be "homozygous genotype." However, if you're looking for a more general synonym, you might consider the phrase "identical alleles," as homozygous refers to having two identical alleles for a given gene. In specific contexts, you might use terms like "purebred" or "true-breeding" as well, particularly in genetics and breeding discussions.
An alternative to the term homozygous
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