【多选题】回交的遗传效应包括以下哪些?
A.
在回交过程中,杂合基因型逐渐减少,纯合基因型相应地增加。
B.
回交子代基因型的纯合是定向的,朝轮回亲本方向纯合。
C.
在相同育种进程内,回交比自交达到某种纯合基因型个体的频率快。
D.
在不加选择的情况下,回交消除不利基因的概率远比自交高
【单选题】患者女性,28岁。胃大部切除术后4天,体温38.5℃,切口疼痛,应考虑
【判断题】人工售票机能发售单程票和其他类型的车票以及非接触式智能卡。
【单选题】What detail in the article shows how Iwantmyoceanback is fighting pollution?
A.
"But when I saw the way the oceans had become I got upset."
B.
They started a group to help. It is called Iwantmyoceanback.
C.
Now the group holds events. There are meetings to make money. The money will help clean up beaches.
D.
Sasha started a YouTube channel online. She shares videos. She started a show called "Table Talks."
【单选题】患者女性,28岁。胃大部切除术后4天,体温38.5℃,切口疼痛,应考虑
【单选题】The table below shows the enrollment in various classes at a certain college. Although no student is enrolled in all three classes, 15 are enrolled in both Biology and Physics, 10 are enrolled in both...
【单选题】患者女性,28岁。胃大部切除术后4天,体温5°C,切口疼痛,应考虑
【单选题】患者女性,28 岁。胃大部切除术后 4 天,体温 38.5°C,切口疼痛,应考虑
【单选题】在对机电设备进行拆卸时,一般是先拆卸( )