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what is A tool that will show all of the possible outcomes of a genetic cross
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GPT-5 mini
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A Punnett square.
A Punnett square is a simple grid diagram that shows all possible genotypes resulting from a genetic cross and their relative probabilities. It’s used to predict offspring ratios for traits controlled by one or more genes.
How to use (monohybrid example):
- Parent genotypes: Aa × Aa
- Put one parent’s gametes (A and a) across the top and the other parent’s down the side.
- Fill the boxes with the combined alleles.
Top: A | a
Side A: AA | Aa
a: Aa | aa
Resulting genotypes: 1 AA : 2 Aa : 1 aa (genotype probabilities 25%, 50%, 25%). If A is dominant, phenotype ratio is 3 dominant : 1 recessive.
Notes:
- For dihybrid crosses use a 4×4 Punnett square or use the fork/branch method.
- Punnett squares assume independent assortment and no linkage, mutation, or selection — real populations may differ.
A Punnett square is a simple grid diagram that shows all possible genotypes resulting from a genetic cross and their relative probabilities. It’s used to predict offspring ratios for traits controlled by one or more genes.
How to use (monohybrid example):
- Parent genotypes: Aa × Aa
- Put one parent’s gametes (A and a) across the top and the other parent’s down the side.
- Fill the boxes with the combined alleles.
Top: A | a
Side A: AA | Aa
a: Aa | aa
Resulting genotypes: 1 AA : 2 Aa : 1 aa (genotype probabilities 25%, 50%, 25%). If A is dominant, phenotype ratio is 3 dominant : 1 recessive.
Notes:
- For dihybrid crosses use a 4×4 Punnett square or use the fork/branch method.
- Punnett squares assume independent assortment and no linkage, mutation, or selection — real populations may differ.
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