The characters which appear in the first filial generation are called

Options

A. recessive characters
B. dominant characters
C. holandric characters
D. lethal characters

Explanation

To answer the question, "The characters which appear in the first filial generation are called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Filial Generations**: The term "filial" refers to the offspring in genetic crosses. The first filial generation (F1) is the first generation of offspring resulting from a cross between two parental (P) individuals.

2. **Identifying Dominant and Recessive Traits**: In genetics, traits can be classified as dominant or recessive. Dominant traits are those that are expressed in the phenotype even when only one copy of the allele is present. Recessive traits are expressed only when two copies of the allele are present.

3. **Performing a Genetic Cross**: Consider a cross between two heterozygous tall plants (Tt x Tt). Here, "T" represents the dominant allele for tallness, and "t" represents the recessive allele for dwarfism.

4. **Constructing a Punnett Square**: By setting up a Punnett square for the cross (Tt x Tt), we can determine the possible genotypes of the offspring:
- TT (homozygous dominant)
- Tt (heterozygous)
- Tt (heterozygous)
- tt (homozygous recessive)

5. **Calculating the Phenotypic Ratio**: From the Punnett square, we can see the phenotypic ratio of the offspring:
- 3 Tall (TT and Tt) : 1 Dwarf (tt)
This indicates that the dominant trait (tallness) appears more frequently in the F1 generation.

6. **Conclusion**: The characters that appear in the first filial generation (F1) are the dominant traits. In this example, tallness is the dominant character that appears in the F1 generation.

### Final Answer:
The characters which appear in the first filial generation are called **dominant characters**.

---