SOLUTION: Punnett Square Worksheet 1 - Studypool - Free Printable

Problem Overview:

The task involves completing monohybrid crosses using Punnett squares. For each cross, we need to:
1. Draw the Punnett square.
2. List the genotypic ratio.
3. Describe the phenotypic outcome based on the given information that capital letters represent dominant traits.

Solution:

#### Example:
A green pea plant (GG) is crossed with a green pea plant (Gg).

- Punnett Square:
```
G G
G GG GG
g Gg Gg
```

- Genotypic Ratio:
- GG : Gg = 2 : 2 (or simplified to 1 : 1)

- Phenotypic Outcome:
- All offspring will be green because "G" is dominant over "g".

---

#### Problem 1:
A green pea plant (GG) is crossed with a yellow pea plant (gg).

- Punnett Square:
```
G G
g Gg Gg
g Gg Gg
```

- Genotypic Ratio:
- Gg : gg = 4 : 0 (or simply Gg)

- Phenotypic Outcome:
- All offspring will be green because "G" is dominant over "g".

---

#### Problem 2:
A tall plant (TT) is crossed with a tall plant (TT).

- Punnett Square:
```
T T
T TT TT
T TT TT
```

- Genotypic Ratio:
- TT : Tt = 4 : 0 (or simply TT)

- Phenotypic Outcome:
- All offspring will be tall because "T" is dominant over "t".

---

#### Problem 3:
A tall plant (TT) is crossed with a short plant (tt).

- Punnett Square:
```
T T
t Tt Tt
t Tt Tt
```

- Genotypic Ratio:
- Tt : tt = 4 : 0 (or simply Tt)

- Phenotypic Outcome:
- All offspring will be tall because "T" is dominant over "t".

---

#### Problem 4:
A red flower (RR) is crossed with a white flower (rr).

- Punnett Square:
```
R R
r Rr Rr
r Rr Rr
```

- Genotypic Ratio:
- Rr : rr = 4 : 0 (or simply Rr)

- Phenotypic Outcome:
- All offspring will be red because "R" is dominant over "r".

---

#### Problem 5:
A white flower (rr) is crossed with a white flower (rr).

- Punnett Square:
```
r r
r rr rr
r rr rr
```

- Genotypic Ratio:
- rr : rr = 4 : 0 (or simply rr)

- Phenotypic Outcome:
- All offspring will be white because both parents are homozygous recessive.

---

#### Problem 6:
A black chick (BB) is crossed with a black chick (BB).

- Punnett Square:
```
B B
B BB BB
B BB BB
```

- Genotypic Ratio:
- BB : Bb = 4 : 0 (or simply BB)

- Phenotypic Outcome:
- All offspring will be black because "B" is dominant over any other allele.

---

Final Answer:

\boxed{
\begin{array}{l}
\text{1. Genotypic Ratio: Gg : gg = 4 : 0; Phenotypic Outcome: All green} \\
\text{2. Genotypic Ratio: TT : Tt = 4 : 0; Phenotypic Outcome: All tall} \\
\text{3. Genotypic Ratio: Tt : tt = 4 : 0; Phenotypic Outcome: All tall} \\
\text{4. Genotypic Ratio: Rr : rr = 4 : 0; Phenotypic Outcome: All red} \\
\text{5. Genotypic Ratio: rr : rr = 4 : 0; Phenotypic Outcome: All white} \\
\text{6. Genotypic Ratio: BB : Bb = 4 : 0; Phenotypic Outcome: All black} \\
\end{array}
}