Free Printable WorksheetScienceGrade 7Science CurriculumMS-LS4-6

7.57 Mathematical Representations of Trait Frequencies Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 7 Science worksheet provides structured practice on 7.57 Mathematical Representations of Trait Frequencies. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Mathematical Representations of Trait Frequencies - Which graph best supports a claim about changing trait frequencies under selection? (NGSS MS‑LS4‑6; CCSS MP.4)

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 7

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 7.57 Mathematical Representations of Trait Frequencies skill assessments:

Problem 1Difficulty: Mastery
A cactus population had thorny-trait counts of 18 of 90, 30 of 100, 52 of 110, and 72 of 120 after grazing pressure increased. Which representation best supports the claim that grazing selected for thornier cacti?
AA pie chart of the final generation only
BA bar graph of yearly rainfall only
CA line graph of thorny-trait frequency across generations: 20%, 30%, about 47%, and 60%
DA line graph of total cactus count only
Solution & Explanation:The line graph of trait frequency directly shows that the thorny trait became more common as grazing pressure continued.
Problem 2Difficulty: Mastery
A student wrote, 'The graph proves individual rabbits changed fur color during life.' Which correction is best?
AThe graph only measures rabbit age, not fur color.
BThe graph shows that fur-color frequency changed in the population across generations.
CThe graph cannot be used to study populations.
DThe graph proves every rabbit changed color more than once.
Solution & Explanation:Graphs like these track population-level trait frequencies over time. They do not show individuals transforming one trait into another during life.
Problem 3Difficulty: Mastery
Use the graph. Which explanation is best supported by these data?
APredation likely selected for deep-bodied fish because the trait increased only in the predator tanks.
BTrait frequency cannot be compared between tanks.
CDeep bodies became more common because all fish grew larger with age.
DThe no-predator tanks show stronger selection than the predator tanks.
Solution & Explanation:The deep-body trait rises from 25% to 70% in predator tanks but stays near 25% in no-predator tanks, which supports predation as the selection pressure.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 7 Science students. It aligns with educational standard MS-LS4-6 (Primary standard selected for prompt fields in this prompt cell: NGSS MS-LS4-6. Skill statement in this prompt cell: Which graph best supports a claim about changing trait frequencies under selection? Associated standards listed with this skill in this prompt cell: NGSS MS-LS4-6; CCSS MP.4. Use this prompt-provided wording as the supporting standard description for this workflow.).

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