Genic balance theory was given by

Options

A. Bridges
B. Morgan
C. Boveri
D. Muller

Answer

**Step-by-Step Solution:**

1. **Identify the Theory**: The question asks about the Genic Balance Theory. This theory is related to sex determination in organisms, particularly in Drosophila (fruit flies).

2. **Research the Origin**: The Genic Balance Theory was proposed by a scientist named Bridges. This is a critical piece of information that directly answers the question.

3. **Understand the Context**: The theory explains how sex is determined in Drosophila based on the ratio of autosomes (non-sex chromosomes) to sex chromosomes. This is important for understanding the implications of the theory.

4. **Summarize Key Points**:
- In Drosophila, females typically have a ratio of 2:2 (two sets of autosomes and two X chromosomes), while males have a ratio of 2:1 (two sets of autosomes and one X chromosome).
- The presence or absence of the Y chromosome also plays a role in determining male characteristics, but the ratio is the primary determinant.

5. **Conclude**: Based on the research and understanding of the Genic Balance Theory, the answer to the question "Genic balance theory was given by" is **Bridges**.

**Final Answer**: Bridges

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