Celeste asked for the money as a down payment on an old farmhouse.西莉斯特要这笔钱来支付购买一家旧农舍的首付。He tried to recall the layout of the farmhouse...他努力回想农舍的布局。Nichols set off for his remote farmhouse in Connecticut...尼科尔斯动身去他在康涅狄格州...
此时每条染色体由一对染色单体构成,这两条联合的染色体称为四分体.At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.这种四分体最终萎缩或被再吸收.The tetrads eventually shrivel or are resorbed.结果形成二分体孢子...