由______和______互作控制的不育类型叫质核型雄性不育。它败育过程发生较______,但不育性能够得到______和__
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不同组合的不育株与可育株杂交得到以下后代:
写出各杂交组合中父本的遗传组成。
基因型为rr的左旋椎实螺作母本与Rr的右旋父本交配,F1代产生右旋和左旋2种个体,且比例各占一半。
玉米条斑叶的遗传是属于母性遗传,而引起条斑性状表现的胞质基因的性质又受有关核基因的控制。
We know from the text that Pete________
[A]was trained to stay at station
[ B ] often plays with food before he eats
[ C ] likes to eat fish without fins
[ D] was smart in teaching the bird a lesson