Changes in allele frequency due to migration

mij = gene flow = # breeding immigrants from donor population j

size of recipient population i

migrants (m) moving from donor (j) to recipient (i)

Change in allele frequency (q) in population i:

Before After

Recipient i qi qi’ = (1-mij) qi + mij qj

Donor j qj qj

j i

“jump” “into”

41A