According to the biological species concept, for speciation to occur, at least one gene, affecting one reproductive barrier, must change.
What is the biological species?
A biological species is a collection of animals that can reproduce with one another in the wild and produce healthy offspring. Species are segregated from other groups in terms of reproduction because they are able to procreate with individuals of different species. Sometimes referred to as a species, taxonomy's most basic classification is its most basic category. Organisms are categorized using a scientific system called taxonomy, which takes into account their biological characteristics. According to their shared ancestry and evolutionary history, species can also be categorized. This method of identifying species is known as phylogenetics, which is the study of the evolutionary relationships between organisms. The process by which a new species develops is called speciation.
By defining a species as a group of creatures with the capacity to interbreed and generate fertile offspring, Ernst Mayr introduced the idea of a biological species. Interbreeding within that particular species maintains the integrity of the species hierarchy in balance. The organisms of different kinds have impediments to reproduction.
Therefore, the correct option is option (D).
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