植物受粉中支配花粉和花柱性质的基因。它决定着可育性和不育的性质。例如樱桃具有S1、S2、S3、S4等S基因,其具有S1S2基因的花粉,即使着落于S1或S2基因型的花柱上,也不能在此花柱上发芽,而产生同一基因的自体不育。与此相反,在具有与花柱不同的S基因S3或S4的花粉,便可在花柱上发芽伸长,并受精结果,产生具有S1、S2、S3、S1S4、S2S4等基因型的接合体而结出种子来。认为这种情况就是由于具有不同的S基因造成的。
Well, I talked about the problem of using plasmids in gene therapy, that it's very difficult to get them into cells.
我们之前讨论过,基因治疗中运用质粒的问题,质粒本身极难进入细胞
They suggest there is something in the genes that explains the characteristics of particular people; that is certainly not true. So let's understand each other.
他们认为基因的某些特点,决定了特定人群的特征,这显然是不正确的,让我说得更明白点
Next week we're going to talk about genes and genetic engineering, that's Chapter 3.
下周我们会讨论基因和基因工程,就是第三课的内容了
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