Different Sequence Length Distribution between forward and reverse reads
I'm a new to trimming and QC of fastq files. I have human WES fastq files (reverse and forward) and ran FastQC on them and the adapters have already been trimmed by the sequence provider. For all the individuals, the sequence length distribution for the forward and reverse read lengths are similar ~100, but for 2 individuals, the sequence length distribution for the forward reads is ~100 and for the reverse reads is ~50. My question is: is it normal to have such drastically different sequence length distributions for the forward (~100) and reverse (~50) reads?
Thank you in advance!
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