To determine the heterozygous condition of an individual , it is crossed with the homozygous recessive counterpart .Such a cross is known as

Options

A. Reciprocal cross
B. Dihyrid cross
C. Test cross
D. Back cross

Answer

To determine the heterozygous condition of an individual, we can follow these steps:

1. **Understanding the Terms**: First, we need to understand the terms involved in the question. A heterozygous individual has two different alleles for a trait (e.g., Aa), while a homozygous recessive individual has two identical recessive alleles (e.g., aa).

2. **Setting Up the Cross**: To determine if the individual in question is heterozygous, we perform a genetic cross. This involves crossing the individual with a homozygous recessive counterpart.

3. **Performing the Test Cross**: The cross between the heterozygous individual (let's say Aa) and the homozygous recessive individual (aa) is performed. This is known as a test cross.

4. **Analyzing the Offspring**: The offspring from this cross will help us determine the genotype of the original individual. If any offspring show the dominant phenotype, it indicates that the individual was heterozygous (Aa). If all offspring show the recessive phenotype, the individual is homozygous dominant (AA).

5. **Conclusion**: Therefore, the type of cross used to determine the heterozygous condition of an individual is called a test cross.

**Final Answer**: Such a cross is known as a test cross.