Write the correct type of selection below (Disruptive, Directional, or Stabilizing). Starlings produce an average of five eggs in each clutch. If
there are more than five, the parents cannot adequately feed the young. If there are fewer
than five, predators may destroy the entire clutch. As a result, five eggs becomes the most
common clutch size.
Seed cracker birds have either large beaks or small beaks.
They do not have medium sized beaks because medium sized beaks do not allow for adequate
cracking of seeds.
Black rabbits (BB) and white rabbits (bb) are both able to
survive because they can camouflage into the white and black rocks in their environment.
However, the intermediate gray rabbits (Bb) do not survive. This results in only white and
black rabbits.
A scientist measures the circumference of acorns in a
population of oak trees and discovers that the most common circumference is 2 cm. There are
very few acorns with circumferences of 3 cm or circumferences of 1 cm. Only the 2 cm
circumference acorns survive.
Female birds that lay close to the optimum number of eggs
have the most surviving offspring. Those that lay fewer or more eggs have lower relative
fitness.
Small lizards have difficulty defending territories so they end
up dying out. Large lizards are more likely to be preyed upon by owls. Over time, only medium
sized lizards end up surviving