Ans C mutation is positive or negative and in large amount offspring is produced by asexual and sexual and vegetative reproduction but genetic variation is present in offspring they are produced by sexual reproduction

The primary biological importance of sexual reproduction in an organism is the promotion of genetic variability among offspring. This is achieved through the combination of genetic material from two parent organisms, resulting in new combinations of genes in their offspring. While it is true that sexual reproduction can have additional benefits, such as increased offspring production and the potential for new mutations, the main advantage lies in the genetic diversity it generates.

Promotes Genetic Variability Among Offspring:
Sexual reproduction involves the fusion of gametes, specialized cells that carry half the genetic information of the parent organism. This fusion combines the genetic material from two different individuals, resulting in offspring that inherit a unique combination of genes. This genetic variability is crucial for the survival and adaptation of species in changing environments.

Increases Adaptability:
By introducing new gene combinations, sexual reproduction increases the potential for genetic variation within a population. This variation provides a greater pool of traits and characteristics that can be selected for or against in response to environmental changes. In contrast, asexual reproduction, which involves the production of genetically identical offspring, limits the potential for adaptation to new conditions.

Enhances Disease Resistance:
Genetic diversity resulting from sexual reproduction plays an essential role in the defense against diseases and parasites. The combination of genes from two individuals increases the likelihood of offspring inheriting advantageous traits that confer resistance to pathogens. This genetic variation helps prevent the spread of diseases within a population and allows for a more effective response to new pathogens that may arise.

Facilitates Evolution:
The genetic variability generated by sexual reproduction is a driving force behind evolution. Through natural selection, individuals with beneficial traits have a higher chance of survival and reproduction, leading to the transmission of these advantageous genes to future generations. Over time, this process can result in the accumulation of beneficial traits and the adaptation of the species to its environment.

Conclusion:
While sexual reproduction does have additional advantages, such as the potential for new mutations and increased offspring production, the primary biological importance lies in the promotion of genetic variability among offspring. This genetic diversity enhances adaptability, disease resistance, and facilitates evolution. By combining the genetic material of two individuals, sexual reproduction provides a mechanism for species to respond to changing environments and increase their chances of survival and reproductive success.