
Natural Selection Curves
Authored by Fayris Francis
Science
7th - 12th Grade
NGSS covered
Used 91+ times

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12 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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.
Directional Selection
Stabilizing Selection
Disruptive Selection
Tags
NGSS.HS-LS4-4
NGSS.HS-LS4-2
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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.
Directional Selection
Stabilizing Selection
Disruptive Selection
Tags
NGSS.HS-LS4-4
NGSS.HS-LS4-2
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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.
Directional Selection
Stabilizing Selection
Disruptive Selection
Tags
NGSS.HS-LS4-4
NGSS.HS-LS4-2
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
_A population of Madagascar hissing cockroaches lives in a woodpile. The
cockroaches are eaten by lizards. Because the lizards have small heads, the lizards are unable to eat the very largest
adult cockroaches, and instead prey upon small and medium sized adults. Over time, only the large headed lizards
survive.
Directional Selection
Stabilizing Selection
Disruptive Selection
Tags
NGSS.HS-LS4-4
NGSS.HS-LS4-2
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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.
Directional Selection
Stabilizing Selection
Disruptive Selection
Tags
NGSS.HS-LS4-4
NGSS.HS-LS4-2
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A population of birds with various size beaks eats seeds. Small seeds can be eaten
by birds with small beaks. Larger, thicker seeds can only be eaten by birds with larger, thicker beaks. During a
drought, only large thick seeds exist so only the large, thick-beaked birds survive.
Directional Selection
Stabilizing Selection
Disruptive Selection
Tags
NGSS.HS-LS4-4
NGSS.HS-LS4-2
NGSS.HS-LS4-5
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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.
Directional Selection
Stabilizing Selection
Disruptive Selection
Tags
NGSS.HS-LS4-4
NGSS.HS-LS4-2
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