SOLUTION: Punnett Square Worksheet 1 - Studypool - Free Printable

It looks like you've uploaded a Punnett square worksheet with several monohybrid crosses, and the task is to complete each cross by:

1. Drawing a Punnett square.
2. Listing the genotypic ratio.
3. Describing the phenotypic ratio.
4. Remembering that capital letters represent dominant alleles, and lowercase letters represent recessive alleles.

Let’s go through each problem one by one, verify the answers, and explain them clearly.

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🔹 Example:

> A green pea plant (GG) is crossed with a green pea plant (Gg).

Parental Genotypes: GG × Gg
Gametes: G and G from first parent; G and g from second.

```
G G
-------------
G | GG | GG
-------------
g | Gg | Gg
```

- Genotype Ratio: 2 GG : 2 Gg → Simplified: 1 GG : 1 Gg
- Phenotype: Green (since G is dominant), so all offspring are green.
- Phenotypic Ratio: 4 green : 0 yellow

✔ Correctly completed in your image.

---

🔹 Problem 1:

> A green pea plant (Gg) is crossed with a yellow pea plant (gg)

Parental Genotypes: Gg × gg
Gametes: G, g (from Gg); g, g (from gg)

```
G g
-------------
g | Gg | gg
-------------
g | Gg | gg
```

- Genotype Ratio: 2 Gg : 2 gg → 1 Gg : 1 gg
- Phenotype:
- Gg → green (dominant)
- gg → yellow (recessive)
- Phenotypic Ratio: 2 green : 2 yellow → 1:1

✔ Your answer matches this.

---

🔹 Problem 2:

> A tall plant (TT) is crossed with a tall plant (Tt)

Parental Genotypes: TT × Tt
Gametes: T, T (from TT); T, t (from Tt)

```
T T
-------------
T | TT | TT
-------------
t | Tt | Tt
```

- Genotype Ratio: 2 TT : 2 Tt → 1 TT : 1 Tt
- Phenotype: Both TT and Tt are tall (T is dominant)
- Phenotypic Ratio: 4 tall : 0 short

✔ Your answer is correct.

---

🔹 Problem 3:

> A tall plant (Tt) is crossed with a short plant (tt)

Parental Genotypes: Tt × tt
Gametes: T, t (from Tt); t, t (from tt)

```
T t
-------------
t | Tt | tt
-------------
t | Tt | tt
```

- Genotype Ratio: 2 Tt : 2 tt → 1 Tt : 1 tt
- Phenotype:
- Tt → tall
- tt → short
- Phenotypic Ratio: 2 tall : 2 short → 1:1

✔ Your answer is correct.

---

🔹 Problem 4:

> A red flower (Rr) is crossed with a white flower (rr)

Parental Genotypes: Rr × rr
Gametes: R, r (from Rr); r, r (from rr)

```
R r
-------------
r | Rr | rr
-------------
r | Rr | rr
```

- Genotype Ratio: 2 Rr : 2 rr → 1 Rr : 1 rr
- Phenotype:
- Rr → red (R dominant)
- rr → white
- Phenotypic Ratio: 2 red : 2 white → 1:1

✔ Correct.

---

🔹 Problem 5:

> A white flower (rr) is crossed with a white flower (rr)

Parental Genotypes: rr × rr
Gametes: r, r from both

```
r r
-------------
r | rr | rr
-------------
r | rr | rr
```

- Genotype Ratio: 4 rr → all rr
- Phenotype: All white (since rr is white)
- Phenotypic Ratio: 0 red : 4 white

✔ Correct.

---

🔹 Problem 6:

> A black chicken (BB) is crossed with a black chicken (Bb)

Parental Genotypes: BB × Bb
Gametes: B, B (from BB); B, b (from Bb)

```
B B
-------------
B | BB | BB
-------------
b | Bb | Bb
```

- Genotype Ratio: 2 BB : 2 Bb → 1 BB : 1 Bb
- Phenotype:
- BB and Bb → both black (B is dominant)
- Phenotypic Ratio: 4 black : 0 other color

✔ Correct.

---

## ✔ Final Summary of All Problems:

| Problem | Parents | Genotype Ratio | Phenotype Ratio |
|--------|---------|----------------|------------------|
| 1 | Gg × gg | 1 Gg : 1 gg | 1 green : 1 yellow |
| 2 | TT × Tt | 1 TT : 1 Tt | 4 tall : 0 short |
| 3 | Tt × tt | 1 Tt : 1 tt | 1 tall : 1 short |
| 4 | Rr × rr | 1 Rr : 1 rr | 1 red : 1 white |
| 5 | rr × rr | 4 rr | 0 red : 4 white |
| 6 | BB × Bb | 1 BB : 1 Bb | 4 black : 0 other |

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## 📌 Key Concepts:
- Dominant allele = capital letter (e.g., G, T, R, B)
- Recessive allele = lowercase letter (e.g., g, t, r, b)
- Genotype = genetic makeup (e.g., GG, Gg, gg)
- Phenotype = observable trait (e.g., green, yellow, tall, short)
- In monohybrid crosses, we consider only one gene/trait at a time.

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✔ All the Punnett squares and answers in your worksheet are correct! Well done!

Let me know if you'd like this formatted as a printable PDF or need help with dihybrid crosses next!