uncheck checkbox programatically in reactjs

I am messing with checkboxes and I want to know that is there a way in which I can uncheck a checkbox on click of a button by calling a function?? If so? How can I do that?

<input type="checkbox" className="checkbox"/>
<button onClick={()=>this.unCheck()}

How can I uncheck the checkbox programatically and what if I have multiple checkboxes generated dynamically using map function. How can I uncheck them If I want to??

Any help much appreciated.. :)

Thanks in advance