How many genes must change in order to form a new species?

• A. 1
• B. 26
• C. 4
• D. 14
• E. There is no set number of genes or loci that produces a new species. Genetic and environmental factors interact.

Answer: (E)

Verified step by step guidance

1. Understand the concept of speciation: Speciation is the process by which populations evolve to become distinct species. It involves genetic changes that lead to reproductive isolation.
2. Recognize that speciation is influenced by multiple factors: These include genetic mutations, natural selection, genetic drift, and environmental changes. These factors can lead to the accumulation of genetic differences over time.
3. Acknowledge that there is no fixed number of genes involved: The number of genetic changes required for speciation can vary widely depending on the organisms and the environmental context.
4. Consider the role of reproductive isolation: For a new species to form, there must be reproductive barriers that prevent interbreeding with the original population. These barriers can be prezygotic (before fertilization) or postzygotic (after fertilization).
5. Understand that speciation is a complex and gradual process: It often involves the interaction of multiple genes and environmental factors, making it difficult to pinpoint a specific number of genes responsible for the formation of a new species.