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孖生(粵拼:maa1 saang1),又叫孖胎、雙生、雙胞胎,係人同其他胎生動物同一次生仔生咗兩個出嚟。
孖生主要分同卵孖生、異卵孖生兩種。前者因為嚟自同一粒受精卵,所以個樣會好似,好易睇得出係孖生。後者因為精子唔同,差別就會大啲,而且有機會唔同性別,叫龍鳳胎。
孖生出世時間通常相差唔夠一個鐘,先出世嘅叫大孖,遲出世嘅叫細孖。
孖胎有得分做同卵(identical)同異卵(fraternal)兩種:
異卵孖胎指兩個嚟自兩粒唔同嘅受精卵;喺前者嗰種情況下,而喺呢種情況下,兩兄弟姊妹嘅基因得嗰大約 50% 相同。
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