"selfish DNA" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "selfish DNA (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A DNA sequence that spreads by forming additional copies of itself within the genome and makes no specific contribution to the reproductive success of its host organism."
      ],
      "hyponyms": [
        {
          "word": "transposon"
        },
        {
          "word": "homing endonuclease gene"
        },
        {
          "word": "supernumerary B chromosome"
        }
      ],
      "id": "en-selfish_DNA-en-noun-g8wsd-9a",
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "selfish DNA"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "selfish DNA (uncountable)",
      "name": "en-noun"
    }
  ],
  "hyponyms": [
    {
      "word": "transposon"
    },
    {
      "word": "homing endonuclease gene"
    },
    {
      "word": "supernumerary B chromosome"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A DNA sequence that spreads by forming additional copies of itself within the genome and makes no specific contribution to the reproductive success of its host organism."
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "selfish DNA"
}