假定基因A是视网膜正常所必需的,基因B是视神经正常所必需的。

 假定基因A是视网膜正常所必需的,基因B是视神经正常所必需的。现有基因型为AaBB的双亲,他们所生后代中,视觉不正常的可能性是(      

  A.316         B.416      C.34   D.14

答案

B

D

相关题目

下列加点的熟语,使用正确的一项是(    ) A.巴金笔耕
下列加点的熟语,使用正确的一项是(    ) A.巴金笔耕不辍,著作等身,以人品文品,确立了自己在人民群众心目中的崇高地位。他的文学成就是
 The robber tried every means, but couldn’t _____ being caught by the police
 The robber tried every means, but couldn’t _____ being caught by the policemen finally.     A. choose                 B. protect                        C.
在三角形内部到三角形三个顶点距离相等的点应是三角形的
在三角形内部到三角形三个顶点距离相等的点应是三角形的(   ) A.三条高的交点  B.三条角平分线的交点  C.三条中线的交点  D.三条垂直平分线的交
―If he ____ , he ____ that food.―Luckily he was sent to the hospital immedia
―If he ____ , he ____ that food.―Luckily he was sent to the hospital immediately.A. was warned; would not take                 B. had been warned; would not have takenC. would be war
 为响应市政府“创建国家森林城市”的号召,某小区计划购
 为响应市政府“创建国家森林城市”的号召,某小区计划购进A、B两种树苗共17棵,已知A种树苗每棵80元,B种树苗每棵60元. (1)若购进A、B两种树苗
下列属于先天性行为的是                       
下列属于先天性行为的是                               (    )  A.蚕吐丝     B.狗拉雪撬     C.马拉车    D.猴子剥花生 
如图所示,光滑水平面上静止放着长L=1.6m,质量为M=3kg的木块
如图所示,光滑水平面上静止放着长L=1.6m,质量为M=3kg的木块(厚度不计),一个质量为m=1kg的小物体放在木板的最右端,m和M之间的动摩擦因数μ=0.1,
Jose Andre Montano Baina was born and raised in the town of Totora,Bolivia—n
Jose Andre Montano Baina was born and raised in the town of Totora,Bolivia—not exactly the home of jazz.But now he is taking the Bolivian and the world music scene by storm.He has already per

最新题目