25% since there's a 25% chance they'd be homozygous dominant(not have CF) and a 50% chance they'd be heterozygous dominant(not have CF) then the last 25% is the potential they'd be homozygous recessive(have CF)
Answer:
Adaptive radiation .
Explanation:
All other finches species are evolved from original seed eating finches.
Plants produce hard seeds in dry season and soft in cold season.. Due to this finches beak get affected