同どう型けい接せつ合ごう体たい

• ホモ接せつ合ごう体たい

  Synonymous; ホモ接合体 is the katakana form, while 同型接合体 uses kanji. Both are used in genetics.

• 異い型けい接せつ合ごう体たい

  Antonym: heterozygote, an individual with two different alleles at a locus.

Compound of 同型 (same type) + 接合体 (zygote), a calque of the English 'homozygote'.