How many questions are in this quiz?

This quiz has 100 questions on monohybrid and dihybrid crosses, ratios, and Mendelian probability.

No. There is no timer, so you can work carefully through Punnett squares and probability steps.

What answer format does the quiz use?

Each question is multiple-choice with 4 options, designed for quick checking and focused practice.

Does it cover both monohybrid and dihybrid crosses?

Yes. You’ll practice single-trait crosses and two-trait crosses, including independent assortment and ratio interpretation.

Can I choose the difficulty or number of questions?

Yes. You can adjust the question count and select a difficulty level to match your study needs.

Mendelian Genetics Crosses Quiz

About this quiz

What you’ll practice

Build confidence with monohybrid and dihybrid crosses by translating traits into alleles, setting up Punnett squares, and interpreting outcomes. You’ll also practice probability, genotype vs. phenotype ratios, and identifying when independent assortment applies.

Every question uses a 4-option multiple-choice format with no timer, so you can slow down and show your reasoning rather than rushing.

Common pitfalls to avoid

Many mistakes come from mixing up genotype and phenotype ratios, or forgetting that heterozygous parents don’t always produce a 3:1 phenotype ratio if the cross isn’t Aa × Aa. Dihybrid problems also trip people up when they assume traits are linked or multiply ratios incorrectly.

Keep allele symbols consistent (A/a, B/b) before you start the cross
Separate genotype ratio from phenotype ratio and label your final answer
For dihybrids with independent assortment, use the product rule (multiply monohybrid probabilities)
Watch for test crosses (unknown genotype × homozygous recessive)
Don’t assume “dominant” means “most common” in a population

Difficulty and question settings

Difficulty is balanced by mixing quick ratio questions with multi-step scenarios that require careful setup and probability. Before you begin, choose your question count and select an easier or harder difficulty to focus on fundamentals or push into more complex dihybrid reasoning.

Tips for better scores

Sketch the cross first, then compute ratios only after you’re sure the parental genotypes are correct. When in doubt, write out gametes explicitly—especially for dihybrid crosses—to prevent missing combinations.