Mendelian principles are not applicable in case of

Options

A. Sex linked alleles
B. Asexually reproducing forms
C. Sexually inbreeding forms
D. Diploid homozygous forms.

Answer

**Step-by-Step Solution:**

1. **Understanding Mendelian Principles**: Mendelian principles, also known as Mendel's laws of inheritance, are based on the observations made by Gregor Mendel through his experiments with garden pea plants (Pisum sativum). These principles include the law of segregation and the law of independent assortment, which apply primarily to sexually reproducing organisms.

2. **Analyzing the Options**:
- **Option A: Sex-linked alleles**: Mendelian principles can apply to sex-linked traits, as they follow specific inheritance patterns based on the sex chromosomes.
- **Option B: Asexually reproducing forms**: Asexual reproduction does not involve the combination of genetic material from two parents, which means Mendelian principles do not apply here.
- **Option C: Sexually inbreeding forms**: Inbreeding is a form of sexual reproduction, and Mendelian principles can apply to these forms.
- **Option D: Diploid homozygous forms**: Diploid homozygous organisms can also exhibit Mendelian inheritance patterns, as they have two identical alleles for a trait.

3. **Conclusion**: Based on the analysis, the only option where Mendelian principles do not apply is **Option B: Asexually reproducing forms**. This is because Mendel's laws were derived from observations of sexual reproduction, which involves the mixing of genetic material.

4. **Final Answer**: Mendelian principles are not applicable in case of **asexually reproducing forms**.

---