Grade 8 Variation and Selection Science Worksheets
Grade 8 science practice: Explain how variation and selection change populations.
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Sample variation and selection questions
Choose the process or outcome that best explains each change described in a population. These examples come from the Easy setting; every generated worksheet draws a fresh set.
- Four siblings with the same two parents each carry a different combination of alleles. Which process produced that shuffling?
sexual reproduction · decrease in allele frequency
- In a large insect population sprayed with a pesticide, only the resistant individuals survive to reproduce, and resistance becomes common. Which process acted here?
gene flow · natural selection
- A breeder chooses only parents with one particular coat type for many generations until the whole line shows it. Which process shaped that line?
artificial selection · genetic drift
- Pollen blows from one isolated wildflower patch to another, and alleles never recorded in the second patch now appear there. Which process occurred?
gene flow · natural selection
Check the sample answers
- sexual reproduction
Sexual reproduction recombines alleles from two parents into new combinations. - natural selection
Unequal survival and reproduction based on a heritable trait is natural selection. - artificial selection
A breeder, rather than the environment alone, decided which individuals reproduced. - gene flow
Gene flow carries alleles from one population into another.
Practice focus
Mutation and sexual reproduction supply the genetic variation in a population. Selection, random chance, and the movement of individuals then change how common each allele becomes over generations.
Grade placement is a planning guide for choosing practice. The registry records standard-code mappings as unreviewed, so these pages are not a claim of alignment with a national standard.
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View worksheets →About these worksheets
Explain how variation and selection change populations. These Grade 8 science worksheets stay with that single skill: every question is answerable from the printed page, and the answer sheet explains why each answer is correct.
How to use the worksheets
- Choose a difficulty, then read the printed directions before answering the first question.
- Complete the questions on paper, marking one answer for each item.
- Compare the result with the answer sheet and read the short explanation together.
How this practice can help students
Mutation and sexual reproduction supply the genetic variation in a population. Selection, random chance, and the movement of individuals then change how common each allele becomes over generations. Generating the page again keeps the same learning goal while changing the questions, so a learner can revisit the skill without repeating the same items.
Review and next steps
Ask the learner to say what made one answer better than the others. Grade placement is a planning guide for choosing practice. The registry records standard-code mappings as unreviewed, so these pages are not a claim of alignment with a national standard.
Explain how variation and selection change populations in Grade 8
Grade 8 science practice: Explain how variation and selection change populations.
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