Are my mixed breed chicks sex linked?

[Queen of Chickens]

Hi! One of my chicks seems to have a stripe on its back while the other one doesn’t…
Could this indicate that one is male and the other female? Thanks!

 

[JacinLarkwell]

Most likely not. What breeds were the parents?

 

[Queen of Chickens]

honestly, i don't know the place where i got them from has around 50 chickens lol

 

[JacinLarkwell]

Then no, they're almost certainly not sexlinked