Problem 10 - Biology: Science for Life with Physiology

Question

One advantage of preserving more than one population of an endangered species at more than one location is ______. A. a lower risk of extinction of the entire species if a catastrophe strikes one location; B. higher levels of inbreeding in each population; C. higher rates of genetic drift in each population; D. lower numbers of heterozygotes in each population; E. higher rates of habitat fragmentation in the different locations

Step-by-Step Solution

Answer

Option A is correct; it lowers extinction risk if a disaster strikes one location.

Step 1: Understanding the Question

We are asked to determine why preserving multiple populations of an endangered species in more than one location is beneficial. Consider that having multiple populations increases an endangered species' chances of survival.

Step 2: Analyzing the Options

Each option should be analyzed to see if it supports the advantage of species preservation: - **A** suggests reducing extinction risk with location diversity, which is plausible. - **B** implies higher inbreeding, which is not beneficial. - **C** mentions increased genetic drift, a random process that usually negatively impacts small populations. - **D** lists lower heterozygosity, usually a disadvantage for genetic diversity. - **E** refers to habitat fragmentation, a negative effect that usually harms species.

Step 3: Selecting the Correct Option

Option A highlights how diversifying geographic locations for populations can lower the extinction risk in case a disaster occurs at a single site, making it the logical choice. Other options reflect disadvantages like inbreeding, genetic drift, and fragmentation.

Key Concepts

Genetic Diversity

Genetic diversity is like nature's insurance policy. It refers to the variety of genes present within a population of a species. Imagine a collection of books; if every book is the same, your knowledge is limited. But if each book is different, you have a wealth of information.

Genetic diversity is crucial because it allows populations to adapt to changing environments. If a disease affects a population, genetic diversity increases the chances of some individuals possessing the genes to survive and reproduce.

Without this diversity, the population is at a greater risk if they're struck by disease or any environmental changes like climate change. Preserving different populations of a species in various locations can maintain this diversity by preventing the negatives of inbreeding and ensuring the presence of a diverse gene pool.

Population Preservation

Population preservation involves maintaining a number of populations of an endangered species across various locations. This strategy acts as a safeguard against possible extinction threats that might be present in one area but not in another.

By preserving multiple populations, we spread the risk much like diversifying investments. If one area faces a natural disaster, disease, or habitat destruction, other populations can continue to thrive.

Additionally, having multiple populations can help researchers and conservationists learn and experiment with different conservation strategies to find the most effective methods for each unique situation. It ensures the species has a greater chance of surviving and adapting to future challenges.

Extinction Risk Reduction

The main objective of conserving endangered species is to reduce their risk of extinction. When populations are isolated and located only in one place, they are severely at risk if any catastrophe occurs.

Catastrophes could be natural events, like earthquakes or floods, or human-made, such as deforestation or pollution.

By distributing populations across multiple, varied habitats, conservationists can reduce the likelihood that a catastrophic event will wipe out the entire species.

• Catastrophic events may not affect all areas at once.
• Some habitats may provide refuge and suitable conditions for continued survival.
• Populations in different areas may evolve unique adaptations that could be crucial for species survival in the long term.

Ultimately, extinction risk reduction ensures a more resilient and adaptable species in the face of numerous and unpredictable global changes.