Genetics Worksheets and Printables - Free Printable

Worksheet Analysis and Solution

The worksheet involves completing Punnett squares for monohybrid crosses and solving related genetics problems. Let's break it down step by step.

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#### Part 1: Complete the Punnett Squares & Fill in the Blanks

##### Problem 1:
- Punnett Square:
```
H h
H HH Hh
h Hh hh
```

- Frequencies:
- HH: 1/4 (25%)
- Hh: 2/4 (50%)
- hh: 1/4 (25%)

- Genotypes:
- P1: Hh × Hh
- F1: HH, Hh, hh

##### Problem 2:
- Punnett Square:
```
a a
A Aa Aa
A Aa Aa
```

- Frequencies:
- AA: 0/4 (0%)
- Aa: 4/4 (100%)
- aa: 0/4 (0%)

- Genotypes:
- P1: Aa × aa
- F1: Aa

##### Problem 3:
- Punnett Square:
```
B b
B BB Bb
b Bb bb
```

- Frequencies:
- BB: 1/4 (25%)
- Bb: 2/4 (50%)
- bb: 1/4 (25%)

- Genotypes:
- P1: Bb × Bb
- F1: BB, Bb, bb

---

#### Part 2: Monohybrid Cross Problems

##### Problem 4:
- Given:
- Tall (T) is dominant over dwarf (t).
- Homozygous tall plant (TT) is crossed with a homozygous dwarf plant (tt).

- Cross: TT × tt

- P1 Genotypes: TT (Tall), tt (Dwarf)

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

- F1 Genotypes: TT, Tt, Tt, tt

- F1 Phenotypes: All Tall (since T is dominant over t)

- Summary:
- Cross: TT × tt
- P1 Genotypes: TT, tt
- F1 Genotypes: TT, Tt, Tt, tt
- F1 Phenotypes: All Tall

##### Problem 5:
- Given:
- Two F1 plants from Problem 4 are crossed with each other.
- From Problem 4, the F1 genotypes are Tt.

- Cross: Tt × Tt

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

- F2 Genotypes: TT, Tt, Tt, tt

- F2 Phenotypes:
- TT: Tall
- Tt: Tall
- tt: Dwarf

- Summary:
- Cross: Tt × Tt
- F1 Genotypes: Tt, Tt
- F2 Genotypes: TT, Tt, Tt, tt
- F2 Phenotypes: 3 Tall, 1 Dwarf

---

Final Answers:

#### Part 1:
1.
- Frequencies: HH: 25%, Hh: 50%, hh: 25%
- Genotypes: P1: Hh × Hh, F1: HH, Hh, hh

2.
- Frequencies: AA: 0%, Aa: 100%, aa: 0%
- Genotypes: P1: Aa × aa, F1: Aa

3.
- Frequencies: BB: 25%, Bb: 50%, bb: 25%
- Genotypes: P1: Bb × Bb, F1: BB, Bb, bb

#### Part 2:
4.
- Cross: TT × tt
- P1 Genotypes: TT, tt
- F1 Genotypes: TT, Tt, Tt, tt
- F1 Phenotypes: All Tall

5.
- Cross: Tt × Tt
- F1 Genotypes: Tt, Tt
- F2 Genotypes: TT, Tt, Tt, tt
- F2 Phenotypes: 3 Tall, 1 Dwarf

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Boxed Final Answer:

\[
\boxed{
\text{See detailed solutions above.}
}
\]