Organism phenotypically similar but genetically different are

Options

A. Heterozygous
B. Homozygous
C. Monozygous
D. Multizygous

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- Begin by defining the key terms in the question: phenotypically similar and genetically different.
- Phenotypically similar organisms have similar physical appearances, while genetically different organisms have different genetic compositions.

2. **Analyzing the Options:**
- The options provided are heterozygous, homozygous, monozygous, and multizygous.
- Evaluate each term:
- **Heterozygous:** Refers to organisms that have different alleles for a trait. They can appear similar phenotypically but have different genetic makeups.
- **Homozygous:** Refers to organisms with identical alleles for a trait. These organisms are both phenotypically and genotypically similar.
- **Monozygous:** Refers to organisms that develop from a single zygote, typically resulting in genetically identical organisms (like identical twins).
- **Multizygous:** Refers to organisms that develop from multiple zygotes, which can lead to genetic diversity.

3. **Identifying the Correct Answer:**
- Based on the definitions, heterozygous organisms are the ones that can be phenotypically similar but genetically different. Therefore, the correct answer is heterozygous.

4. **Conclusion:**
- The organisms that are phenotypically similar but genetically different are called heterozygous.

**Final Answer:**
- The correct answer is **heterozygous**.

---