It is reported that graduate students’ salaries are not as high as expected, some cannot earn as much as university students.
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Mother’s Day is always on a Sunday Thanksgiving is always on a Thursday.
所谓正交,是指将基因型未知的显性个体与隐性纯合体交配,以鉴定显性个体基因型的方法。( )
A. 对
B. 错
孟德尔以豌豆为材料进行了长达八年的研究,终于总结出了遗传学的连锁和交换定律。( )
A. 对
B. 错
色盲是人类伴性遗传的疾病,如果姐妹几人的父亲和外祖父为色盲,母亲正常,她们患色盲的概率应该是( )。
A. 100%
B. 50%
C. 25%
D. 0