Free Printable WorksheetScienceGrade 7Science CurriculumMS-LS3-2

7.51 Incomplete Dominance and Codominance (Introductory) Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 7 Science worksheet provides structured practice on 7.51 Incomplete Dominance and Codominance (Introductory). Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Incomplete Dominance and Codominance (Introductory) - Which scenario demonstrates incomplete dominance (or codominance) most clearly? (NGSS MS‑LS3‑2 connections)

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

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Below are sample questions representative of the exercises included on this worksheet and related 7.51 Incomplete Dominance and Codominance (Introductory) skill assessments:

Problem 1Difficulty: Mastery
A lab report says a pink x pink flower cross produced red, pink, and white offspring, supporting incomplete dominance. Which follow-up prediction is most consistent with that conclusion?
AA pink x white cross should produce pink and white offspring in about equal numbers
BA pink x white cross should produce only red offspring
CA pink x white cross should produce all pink offspring
DA pink x white cross should produce only red-and-white striped offspring
Solution & Explanation:If pink is the heterozygous incomplete-dominance phenotype, then RW x WW should produce about half pink RW and half white WW offspring.
Problem 2Difficulty: Mastery
A genotype card is labeled RW in a codominant red-and-white trait. Which organism picture should be matched to that card?
AAn organism with a blended pink color only
BAn organism with both red and white visible
CA solid white organism
DA solid red organism
Solution & Explanation:In codominance, the heterozygous genotype RW should match a phenotype that shows both traits.
Problem 3Difficulty: Mastery
Which statement correctly connects genotype and phenotype in incomplete dominance?
ARW must look exactly like RR
BRW can have a phenotype different from RR and WW because neither allele fully dominates
CRW cannot pass R or W to offspring
DRW always shows both traits separately
Solution & Explanation:In incomplete dominance, the heterozygote has an intermediate phenotype that is different from both homozygotes.

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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-LS3-2 (Primary standard selected for prompt fields in this prompt cell: NGSS MS-LS3-2. Skill statement in this prompt cell: Which scenario demonstrates incomplete dominance (or codominance) most clearly? Associated standards listed with this skill in this prompt cell: NGSS MS-LS3-2 connections. Use this prompt-provided wording as the supporting standard description for this workflow.).

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