snp analysis

Hello everyone, I got these images from a senior student. I don’t know how to interpret this graph.
I know that its referring to minor allele frequency distribution. But why there is sharp peak near one and then there is decline.

For this graph, I know its showing the count of indel for chr1. but I don’t understand the X axis. Why is it negative?
If anyone can help me in understanding these graphs it would be really helpful

I got these images from a senior student.

Please ask your questions to the Senior Scientist, or refer them to this Biostars post.

Kind regards,

Kevin