Created by Retse Johnson-Daniel
10 questions
9th - 12th Grade
Science
Updated Sep 2026
Designed for Grade 9–12 science students, Monohybrids and the Punnett Square builds foundational genetics knowledge through 10 questions: 9 multiple-choice items and 1 multiple-select item. Students identify homozygous and heterozygous genotypes, distinguish genotype from phenotype, recognize dominant and recessive alleles, and interpret the structure and purpose of a Punnett square. The worksheet also asks students to determine the 1HH:2Hh:1hh genotype ratio and calculate the 25% probability of hairless offspring from a cross between two heterozygous guinea pigs. These questions connect genetics vocabulary to a specific monohybrid cross and reinforce that Punnett squares provide predictions rather than guaranteed outcomes. This free printable worksheet includes a complete answer key for efficient review, independent practice, homework, or formative assessment.
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WorksheetsAnswer Keyhh
A trait that will not usually show up
HH
, b)Hh
Having the same genotype
4
1HH: 2 Hh: 1 hh
Has hair
The physical traits of an organism
25%
They are predictions
This Grade 9–12 science worksheet uses 9 multiple-choice questions and 1 multiple-select question to assess monohybrid genetics. Students classify homozygous and heterozygous genotypes, connect Hh with the hair phenotype and hh with hairlessness, interpret the 1HH:2Hh:1hh offspring ratio, and calculate a 25% probability using a Punnett square.
Introduce genotype, phenotype, homozygous, heterozygous, dominant, and recessive allele vocabulary before students complete the questions. Then model a cross between two Hh guinea pigs, have students explain how the four Punnett-square outcomes produce the 1HH:2Hh:1hh ratio and 25% hairless probability, and use the worksheet to check whether they can distinguish predictions from guaranteed results.
Students may confuse genotype with phenotype, select only HH for a guinea pig with hair, or treat Hh as hairless instead of recognizing the dominant hair phenotype. Watch also for errors in reading the 1HH:2Hh:1hh ratio, such as reporting 50% rather than 25% for hh offspring, and for treating Punnett-square predictions as certain outcomes.
You can assign Monohybrids and the Punnett Square as a printable PDF or as a digital quiz on Wayground, and it includes a complete answer key for all 10 items. For printable submissions, scan student work with the Wayground for Teachers app to streamline grading and review of their genotype, phenotype, ratio, and probability answers.
Use the worksheet’s Advanced Settings to adjust font spacing and font size so the genotype, phenotype, and ratio questions are easier to navigate. You can also enable a dyslexia-friendly font or translate the worksheet into another language when those file-level options support access to the genetics vocabulary and answer choices.
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