Free Printable WorksheetScienceGrade 8Science CurriculumSCI.8.90

8.90 Mutations and Trait Changes Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.90 Mutations and Trait Changes. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Mutations and Trait Changes - Which description best how changes in DNA can alter protein structure/function and thus traits; connect to beneficial, neutral, or harmful effects? (NGSS MS‑LS3‑1/2 (connections); TEKS §112.28 Grade 8; FL NGSSS; VA SOL; MA STE)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 8

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 8.90 Mutations and Trait Changes skill assessments:

Problem 1Difficulty: Mastery

A mutation adds extra DNA bases inside a gene. Afterward, the protein has an extra part and the trait changes.

Which outcome is most likely?

AThe extra part can change the protein’s shape or function, weakening the protein and changing the trait.

BAdding bases must always change every part of the protein after it.

CAdding bases always makes proteins stronger.

DAdding bases prevents any RNA from being made.

Solution & Explanation:Adding extra information to a gene can add to or change the protein. If the protein’s shape or function changes, the trait can change too.

Problem 2Difficulty: Mastery

A weed population has a mutation that helps some plants survive an herbicide. In fields without the herbicide, the mutation provides no clear advantage.

Which statement best describes this mutation’s effect?

AIt is always harmful because it changes a trait.

BIt is always beneficial in every environment.

CIt is neutral in all environments.

DIt is beneficial mainly in the herbicide environment.

Solution & Explanation:Whether a mutation is helpful can depend on the environment. A mutation that helps plants survive herbicide is beneficial where herbicide is used but may not help elsewhere.

Problem 3Difficulty: Mastery

A gene-editing experiment removes two bases near the beginning of a gene. Afterward, the organism shows a strong loss of the gene’s trait.

Which explanation best connects the edit to the trait loss?

ARemoving two bases can change how the rest of the gene is read, so the protein may not work.

BRemoving two bases always removes exactly one protein building block and nothing else.

CRemoving two bases always increases gene expression.

DRemoving two bases changes RNA back into DNA.

Solution & Explanation:Genes are read in groups of bases. Removing two bases near the beginning can shift the grouping and change much of the protein, so the trait can be lost.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 8 Science students. It aligns with educational standard SCI.8.90 (Explain how mutations can change traits and influence organisms.).