In pedigree analysis symbol `Θ` used for

Options

A. Heterozygous for autosomal recessive
B. Affected individuals
C. Death
D. Carrier for sex linked recessive

Answer

**Step-by-Step Solution:**

1. **Understanding Pedigree Analysis**: Pedigree analysis is a method used to study the inheritance patterns of traits in families. It uses specific symbols to represent individuals and their genetic status.

2. **Identifying Symbols**: In pedigree charts:
- A **square** represents a male.
- A **circle** represents a female.
- A **shaded square or circle** indicates an affected individual (i.e., an individual who expresses the trait).
- A **half-shaded square or circle** indicates a heterozygous individual for an autosomal recessive trait.
- A **diagonal line through a square or circle** indicates that the individual is deceased.

3. **Analyzing the Given Symbol (Θ)**: The symbol `Θ` (a circle with a line or dot) is used to represent carriers for sex-linked recessive traits. This means that while these individuals do not express the trait, they carry the allele for it.

4. **Evaluating the Options**: The options provided were:
- A) Heterozygous for autosomal recessive
- B) Affected individuals
- C) Death
- D) Carrier for sex-linked recessive
Based on the analysis of the symbol `Θ`, the correct answer is option D.

5. **Conclusion**: Therefore, in pedigree analysis, the symbol `Θ` is used to denote a carrier for sex-linked recessive traits.

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