什么叫显性基因和隐性基因

2025-02-08 00:57:03
推荐回答(2个)
回答1:

基因在人体的体细胞中都是成对存在的 只有在成熟的生殖细胞(精子和卵子)中 才彼此分离 成单存在 即只剩下23条 而当精子和卵子结合成新的生命一一受精卵时 又恢复到46条
基因有显性和隐性之分 显性基因是在一对基因中决定其表现特征的一基因 这种现象叫表现型 而隐性基因是只有成双存在时才决定其表现特征 例如 胚胎形成时 胎儿要分别接受父亲和母亲的同等基因 假如孩子从父亲的基因里继承了黑眼睛 而从母亲的基因里继承了棕色眼睛 但他最终却长了一双黑眼睛
因为黑眼睛在这里是显性 棕色眼睛是隐性 黑色基因压倒了棕色基因 因此表现型为黑色 然而 在这个孩子的染色体中仍存在棕色眼睛的隐性基因 等他长大后 如果他的妻子和他一样 体内也存在棕色眼睛的隐性基因 那么他们的孩子就可以有一对棕色眼睛 这就是显性基因和隐性基因的区别
基因还具有稳定性和变异性 稳定性是指基因能够通过自体复制 使后代基本保持其祖先的模样 变异性是指基因在一定条件下能够发生 改变 因而引起遗传性状变异 这种改变称为基因突变

回答2:

1

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