A:用正交和反交法,研究某基因在常染色体上还是在性染色体上中
B:用具有相对性状的纯合子杂交,研究哪个性状是显性性状
C:用显性雌型个体与隐性雄型个体杂交,研究某基因是否位于X染色体上
D:用测交法,研究某生物个体是否是纯合子
根据短文理解,选择正确答案。
Brave
Type: 3D cartoon Comedy Running time: 95 minutes
Merida, a princess, refused to marry a person that she dislikes. This causes trouble for her family and the whole country. Merida turns to a witch(女巫) for help. In doing so, her family and the country are in danger. Merida must save her family and the country before it is too late. X K b1.Com
The Grey
Type: Action Running time: 117 minutes
The Grey is based on the short story “Ghost Walker” written by Ian Mackenzie Jeffers. It's about a number of oil men who are in trouble in Alaska after a plane crash(空难). They have to fight against grey wolves that threaten(威胁) their lives.
Mirror Mirror
Type: comedy Running time: 106 minutes
You must know the story of Snow White. Would you like to see this story again? Come to see Mirror Mirror. It's a comedy about Snow White. Lily Collins and Julia Roberts are the main actresses in this interesting movie.
Chimpanzee
Type: Documentary Running time: 78 minutes
This movie is directed by Alastair Fothergill and Mark Linfield. It's a 2012 nature documentary film about a young chimpanzee named Oscar. He is alone in the African forests until he is raised by another chimpanzee. The chimpanzee takes care of Oscar like his own child.
2017年1月3日,教育部下发《关于在中小学地方课程教材中全面落实“ 年抗战”概念的函》,强调“九一八事变”后的抗战历史是前后贯通的整体,应在课程教材中予以系统、准确体现。( )
下列有关秦岭—淮河线地理意义的叙述正确的是( )
在利用图示装置“探究平抛物体运动的规律”实验中,下述操作方法不正确的是( )