Probability of Homozygous vs. Heterozygous Offspring Calculator

When studying genetics, understanding the probability of producing homozygous (same alleles) and heterozygous (different alleles) offspring is essential. Our Probability of Homozygous vs. Heterozygous Offspring Calculator makes this calculation quick and easy, providing visual results using Punnett squares. Whether you’re a student, teacher, or just curious about genetics, this tool offers a clear and interactive way to explore inheritance patterns. Find more accurate and free inheritance prediction tools on our homepage.

Select the genotypes of Parent 1 and Parent 2 (e.g., AA, Aa, or aa). Click Calculate to generate a 2×2 Punnett square that visually represents the possible genetic outcomes. The calculator then classifies each genotype as either homozygous or heterozygous and provides the probabilities for each.

• Genotype Combinations: All possible allele pairings from both parents.
• Homozygous Results: Combinations like AA or aa.
• Heterozygous Results: Combinations like Aa.
• Probabilities: The likelihood (in percentages) of each outcome.

Understanding these probabilities is crucial in genetics because they reveal the potential distribution of traits in offspring. This tool is perfect for:

• Students: Visualizing and reinforcing Mendelian inheritance concepts.
• Teachers: Demonstrating allele combinations and their frequencies.
• Researchers and breeders: Predicting outcomes in plants, animals, and even human genetics.

• Parents: Aa x Aa
• Punnett Square:
  • 25% AA (homozygous dominant)
  • 50% Aa (heterozygous)
  • 25% aa (homozygous recessive)
• Results:
  • Homozygous offspring: 50% (AA + aa)
  • Heterozygous offspring: 50% (Aa)

Our calculator makes these probabilities instantly visible, ensuring you can analyze the results with ease.

1. Select the genotypes of both parents from the dropdown menus.
2. Click Calculate to generate the Punnett square.
3. View results showing genotype combinations and probabilities.
4. See the breakdown of homozygous and heterozygous outcomes.
5. Download or copy results for classwork, reports, or breeding plans.

1. Homozygous vs. Heterozygous:

• Homozygous: Both alleles are the same (e.g., AA or aa).
• Heterozygous: The alleles are different (e.g., Aa).

2. Dominance Patterns:
   This calculator works with classic Mendelian inheritance, assuming simple dominance and recessiveness.
3. Mendel’s Laws:
   Illustrates how alleles segregate and combine independently during gamete formation.

Can this calculator predict trait expression?
It focuses on genotype probabilities. For phenotype predictions, use our Predicting Phenotypes with Punnett Square Calculator.

Is it only for simple traits?
Yes. For polygenic or more complex traits, additional analysis is needed.

Does it include environmental factors?
No, this calculator models only genetic inheritance patterns.

• Dominant-Recessive Trait
• Carrier Probability Calculator
• Autosomal Recessive Trait
• Co-Dominance
• Predicting Phenotypes
• Trihybrid and Polyhybrid Cross Calculator

Our Probability of Homozygous vs. Heterozygous Offspring Calculator simplifies genetics learning by providing instant, visual results. Whether you’re studying inheritance or planning breeding strategies, this tool helps you understand the probability of producing homozygous or heterozygous offspring.