Question

From this Punnett square what would be the predicted outcome from 100 plants?

Answer 1

I don’t see the Punnett square. I can’t give exact numbers without it, but here’s how to get the predicted counts from any Punnett square and a few common examples so you can apply it to your square.

How to get predicted counts for 100 plants
1. Read the Punnett square to get the genotype ratios (e.g., 1 AA : 2 Aa : 1 aa) or phenotype ratios (e.g., 3 dominant : 1 recessive).
2. Convert each ratio part to a fraction of the total (add the parts, divide each part by that total).
3. Multiply each fraction by 100 to get the predicted number of plants.
4. Round to whole plants; if rounding causes the total ≠ 100, adjust the largest category by ±1 to make the sum 100.

Common examples
- Monohybrid heterozygote × heterozygote (Aa × Aa)
Genotypic ratio 1 AA : 2 Aa : 1 aa → fractions 1/4, 1/2, 1/4 → predicted counts: 25 AA, 50 Aa, 25 aa.
Phenotypic ratio (if A is dominant) 3 dominant : 1 recessive → 75 dominant, 25 recessive.

- Heterozygote × homozygous recessive (Aa × aa)
Genotypic/phenotypic ratio 1 Aa : 1 aa → fractions 1/2, 1/2 → predicted counts: 50 Aa, 50 aa (50 dominant if Aa shows dominant trait, 50 recessive).

- Homozygous dominant × homozygous recessive (AA × aa)
All offspring Aa → 100 Aa (100 show dominant phenotype).

- Dihybrid heterozygote × heterozygote (AaBb × AaBb), assuming independent assortment and simple dominance
Phenotypic ratio 9 : 3 : 3 : 1 → fractions 9/16, 3/16, 3/16, 1/16 → predicted counts ≈ 56, 19, 19, 6 (since 9/16×100 = 56.25, 3/16×100 = 18.75, 1/16×100 = 6.25; round as needed).

If you paste the Punnett square or tell me the cross (e.g., Aa × Aa, or AA Bb × Aa bb, etc.), I’ll calculate the predicted counts out of 100 plants for you.