Question

Name the phenomenon that governs the following:
i) Green beetles living in green bushes are not eaten by the crows.
ii) Number of blue beetles in green bushes increases, only because the red beetles living there were trampled by a
herd of elephants.
iii) No ‘medium height plants’ are obtained in F1 generation, upon crossing pure tall and dwarf pea plants.
iv) Tails of mice were surgically removed for several generations; still mice had tails in the following generations.
v) A migrant beetle reproduces with the local population; as a result genes of migrant beetle enter the new
population.

Answer 1

(1.)This happens because the green beetles are visible to the crows in the green bushes.Here,natural selection is responsible.It can be said that the crows exert the natural selection.

Answer 2

1. it can be natural selection on adaptation
2. genetic drift
3. here short short genotypes dominated by tall genotype but here it must be tall not in medium height
4. acquired traits
5. the phenomenon which is occurring in this process is gene flow

hope it helps you