As I understand it:
Recessive means it takes both allele at the same locus to have the mutation before the trait will express itself.
Co-dominant means there will be an expression of the trait if one allele has the mutation and an enhanced version of the trait if both allele at the same locus have the mutation.
Dominant means if either or both of the allele at the same locus have the mutation at the same locus it will express the same trait.
Heterozygous means that one allele at the same locus has said mutation.
Homozygous means that both allele at the same locus have said mutation.
To me these definitions all make sense and work within the confines of my OP. My original question was whether anyone has seen or heard of a homo-spider, to which the answer seems to be no.
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