Question

When does a species become founders to cause founder effect?

Answer 1

Answer: When the change in allele frequency is so different in the new sample of population that they become a different species, the original drifted population becomes founder.

Answer 2

$\huge{ \underline{\underline{ \fcolorbox{white}{pink}{\sf{Answer :-}}}}}$

the original drifted population becomes found us and the effect is called founder effect