Question

Homeostasis that leads to adaptability and stability is NOT favoured by

• A. Self-pollination
• B. Heterogeneity
• C. Heterozygosity
• D. Genetic polymorphism

Hint:

Genetic buffering (homeostasis) is driven by diversity:
Individual buffering $\rightarrow$ Favored by heterozygosity.
Population buffering $\rightarrow$ Favored by heterogeneity and genetic polymorphism.
Inbreeding via self-pollination reduces this buffering capacity.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Homeostasis in plant genetics refers to the capacity of an individual genotype or a population to adjust its physiological state to varying environmental conditions, ensuring stable growth and reproduction.
This buffering capacity depends on the genetic structure of the individual (developmental homeostasis) or the population (evolutionary homeostasis).

Step 2: Detailed Explanation:
The key factors that contribute to homeostasis, adaptability, and stability include:
1. Heterozygosity: Heterozygous individuals possess different alleles at a locus, which provides a wider range of biochemical pathways to cope with fluctuating environmental stresses.
2. Heterogeneity: A mixture of different genotypes within a population allows the population as a whole to survive diverse environmental challenges.
3. Genetic Polymorphism: The presence of multiple genetic forms within a population ensures that some individuals can tolerate specific stresses, maintaining overall population stability.
In contrast, Self-pollination leads to progressive inbreeding, which increases homozygosity and reduces genetic variation.
Homozygous, homogeneous populations lack the genetic flexibility needed to adapt to changing environments, making them more vulnerable to stress.
Therefore, self-pollination does not favor homeostasis and stability.

Step 3: Final Answer:
Homeostasis that supports adaptability and stability is not favored by Self-pollination, which corresponds to Option (A).