Free Printable WorksheetScienceGrade 7Science CurriculumMS-LS3-2

7.47 Punnett Squares and Probability of Inheritance Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 7 Science worksheet provides structured practice on 7.47 Punnett Squares and Probability of Inheritance. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Punnett Squares and Probability of Inheritance - Which Punnett square correctly predicts offspring genotypes and phenotypes for the cross? (NGSS MS‑LS3‑2; CCSS 7.RP.A.2)

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 7.47 Punnett Squares and Probability of Inheritance skill assessments:

Problem 1Difficulty: Mastery
Two breeding plans are proposed for a dominant trait D. Plan 1 uses DD x dd. Plan 2 uses Dd x dd. Which statement is best?
APlan 2 guarantees all dominant offspring
BBoth plans produce the same genotype ratio
CPlan 1 reveals whether a parent is heterozygous
DPlan 1 gives all dominant-phenotype offspring, while Plan 2 gives a 1:1 dominant-to-recessive phenotype ratio
Solution & Explanation:DD x dd produces all Dd offspring with the dominant phenotype. Dd x dd produces Dd and dd in equal numbers, giving a 1:1 phenotype ratio.
Problem 2Difficulty: Mastery
In the cross Ww x Ww, half of the Punnett square boxes are Ww. What whole-number percent is that? Enter only the number.
Solution & Explanation:Ww x Ww gives WW, Ww, Ww, and ww. Two of the four boxes are Ww, so the answer is 50.
Problem 3Difficulty: Mastery
A lab group got 18 dominant-phenotype plants and 6 recessive-phenotype plants from one cross. Which parent genotypes are most likely?
ACross tt x tt
BCross TT x tt
CCross Tt x Tt
DCross Tt x tt
Solution & Explanation:An 18 to 6 result is exactly a 3:1 phenotype ratio, which is the expected pattern for Tt x Tt.

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Frequently Asked Questions

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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 Punnett square correctly predicts offspring genotypes and phenotypes for the cross? Associated standards listed with this skill in this prompt cell: NGSS MS-LS3-2; CCSS 7.RP.A.2. Use this prompt-provided wording as the supporting standard description for this workflow.).

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