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染色體決定性別，“酸兒辣女”不科學

出處：網(wǎng)絡收集 日期：2024-07-04 09:52:39 編輯：秩名

正常人體體細胞的細胞核里都有23對染色體。其中22對是常染色體，只有一對性染色體決定性別。性染色體分為X染色體和Y染色體兩種。男性體細胞的性染色體分別是X和Y，即XY型；女性體細胞的性染色體兩個都是X，即XX型。
 
精子和卵子所含染色體的數(shù)量是體細胞的一半，即23條染色體。女性產(chǎn)生的卵子只有一種帶X的性染色體。男性產(chǎn)生的精子有兩種染色體，帶X染色體或帶Y染色體的精子各占一半。當帶X染色體的精子和卵子結(jié)合，受精卵的性染色體為XX，便是女胎。帶Y染色體的精子和卵子結(jié)合，受精卵的性染色體為XY，便是男胎。一次射精產(chǎn)生的精子可達幾億之多，是帶X染色體還是帶Y染色體的精子與卵子結(jié)合，完全是偶然的，是大自然的一種選擇。
 
酸兒辣女的說法不科學 
 
在民間流傳著“酸兒辣女”的說法，其實，這種說法是沒有科學道理的，千萬不可相信。
 
胎兒的性別完全是隨機產(chǎn)生的，不以人的意志為轉(zhuǎn)移。在卵子受精的一瞬間就決定了胎兒的性別，無論孕婦服多少中藥、西藥，或請“大師”換胎都是無濟于事的，只能影響母子健康。
 
妊娠以后，滋養(yǎng)細胞分泌絨毛膜促性腺激素（HCG）有抑制胃酸分泌的作用，使孕婦胃酸分泌減少，各種消化酶活性降低，影響消化功能。吃酸性食物可以刺激胃分泌腺，使胃液增加，提高胃酸活性，有利于消化，緩解消化不良癥狀。所以孕婦適當吃橘子、梅子等水果有益處。但如迷信有關“酸兒辣女”的說法，而過多地吃酸辣食物，則會損害身體，甚至對胎兒不利。
 

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