试题与答案

以下不属于二倍体生物配子基因型的是() A.aB B.Aa C.ab D.ABCDE

题型:单项选择题

题目:

以下不属于二倍体生物配子基因型的是()

A.aB

B.Aa

C.ab

D.ABCDE

答案:

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参考答案:起源于心房的异位起搏点所引起的期前收缩称为房性期前收缩。心电图特征:①提前出现的一位P波,其形态与窦性P波不同。P’-R间期≥0.12s。②房性P’波后的QRS波群形态正常。③不完全代偿间...

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