Select the incorrect statement regarding pedigree analysis

Options

A. Solid symbols show unaffected individuals .
B. Square represents male in the pedigree chart.
C. It is useful for genetic counselling.
D. It is an analysis of traits in several generations of a family.

Answer

To solve the question regarding pedigree analysis and select the incorrect statement, we will follow these steps:

### Step 1: Understand Pedigree Analysis
Pedigree analysis is a method used to study the inheritance patterns of traits in families across generations. It helps in determining the presence or absence of a trait and can reveal the genotypes of individuals based on their phenotypes.

**Hint:** Familiarize yourself with the symbols used in pedigree charts, such as squares for males and circles for females.

### Step 2: Evaluate Each Statement
Now, we will evaluate the statements provided in the question:

1. **Statement 1:** A solid symbol shows an unaffected individual.
- This statement is **incorrect**. A solid symbol (filled shape) typically represents an affected individual, not an unaffected one.

2. **Statement 2:** A square represents a male in the pedigree chart.
- This statement is **correct**. In pedigree charts, males are represented by squares.

3. **Statement 3:** It is useful for genetic counseling.
- This statement is **correct**. Pedigree analysis is indeed useful for genetic counseling as it helps understand the risk of inheritance of genetic conditions.

4. **Statement 4:** It is the analysis of the trait in several generations of a family.
- This statement is **correct**. Pedigree analysis examines traits across multiple generations.

### Step 3: Identify the Incorrect Statement
Based on the evaluations, the first statement is the only incorrect one. Therefore, the answer to the question is:

**Answer:** The incorrect statement regarding pedigree analysis is: "A solid symbol shows an unaffected individual."

### Summary
In summary, pedigree analysis is a crucial tool in genetics that helps trace the inheritance of traits through generations. Understanding the symbols and their meanings is essential for accurate interpretation.