Pure line breed refers to

Options

A. heterozygosity and linkage
B. homozygosity and independent assortment
C. heterozygosity only
D. homozygosity only

Answer

**Step-by-Step Solution:**

1. **Understanding Pure Line Breeding**:
- Pure line breeding refers to a breeding method where individuals of the same genotype are mated to produce offspring. This ensures that the offspring will have the same traits as the parents.

2. **Identifying Key Characteristics**:
- In pure line breeding, the individuals are homozygous, meaning they have identical alleles for a particular trait. This results in offspring that consistently exhibit the same phenotype when these individuals are intercrossed.

3. **Analyzing the Options**:
- Option 1: Heterozygosity and linkage – This does not apply to pure line breeding as it involves different alleles.
- Option 2: Homozygosity and independent assortment – This is relevant since pure lines are homozygous and can assort independently during gamete formation.
- Option 3: Heterozygosity only – This is incorrect as pure lines are not heterozygous.
- Option 4: Homozygosity only – While this is partially correct, it does not mention independent assortment, which is also a characteristic of pure line breeding.

4. **Selecting the Correct Answer**:
- Based on the characteristics of pure line breeding and the analysis of the options, the correct answer is **Option 2: Homozygosity and independent assortment**.

**Final Answer**: Option 2: Homozygosity and independent assortment.

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