The hybrid containing allells expressing two contrasting traits are termed as

Options

A. alleles
B. genes
C. homologous chromosomes
D. none of these

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- In genetics, a hybrid refers to an organism that has two different alleles for a particular trait. Alleles are different forms of a gene that can exist at a specific locus on a chromosome.

2. **Contrasting Traits:**
- When we talk about contrasting traits, we are referring to traits that are different from each other, such as tall vs. short plants or brown vs. blue eyes in humans.

3. **Hybrid Formation:**
- A hybrid organism is formed when alleles from two parents combine. For example, one parent may contribute an allele for tallness (T) and the other for shortness (t), resulting in a hybrid genotype (Tt).

4. **Homologous Chromosomes:**
- Homologous chromosomes are pairs of chromosomes (one from each parent) that contain the same genes but may have different alleles. In the context of hybrids, these chromosomes carry contrasting alleles.

5. **Conclusion:**
- Therefore, the hybrid containing alleles expressing two contrasting traits is termed as "heterozygous" or "hybrid." However, the term "homologous chromosomes" refers to the chromosomes themselves that carry these alleles.

**Final Answer:**
The hybrid containing alleles expressing two contrasting traits is termed as "heterozygous" or "hybrid."

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