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The helmeted honeyeater (Lichenostomus melanops cassidix) can be found in forest to the east of Melbourne - VCE - SSCE Biology - Question 7 - 2023 - Paper 1
Question 7
The helmeted honeyeater (Lichenostomus melanops cassidix) can be found in forest to the east of Melbourne. There are only three small wild populations. The bird has ... show full transcript
Worked Solution & Example Answer:The helmeted honeyeater (Lichenostomus melanops cassidix) can be found in forest to the east of Melbourne - VCE - SSCE Biology - Question 7 - 2023 - Paper 1
Step 1
Explain how the genetic diversity of helmeted honeyeaters may change over time as a result of genetic drift.
Answer
Genetic drift is a random change in allele frequency that occurs more prominently in small and isolated populations, such as the helmeted honeyeaters. In such settings, certain alleles may become more common while others may reduce in frequency purely by chance. Over time, this can lead to a decrease in genetic variation within the population, as some alleles may even become completely lost, resulting in a genetic bottleneck. This loss of genetic diversity can increase the population's vulnerability to diseases and reduce its adaptability to environmental changes.
Step 2
How is genetic diversity within the wild populations being maintained?
Answer
Genetic diversity is being maintained through the practice of swapping eggs between captive-bred birds and the wild population. Since the captive population has a different genetic diversity, this gene flow introduces new alleles to the wild population, minimizing the risks associated with genetic drift. This ongoing interchange helps to enrich the genetic pool of the helmeted honeyeaters in the wild, thus supporting their survival and adaptability.
Step 3
Define a consequence-based approach to bioethics and outline how this relates to the work by Zoos Victoria to prevent extinction of the helmeted honeyeater.
Answer
A consequence-based approach in bioethics emphasizes the importance of assessing the outcomes of an action, aiming to maximize positive results while minimizing negative impacts. In the context of Zoos Victoria, this approach is applied by evaluating both the positive outcomes, such as increasing the population of helmeted honeyeaters, and potential negative effects, like unintended consequences on the ecosystem. By carefully analyzing these outcomes, Zoos Victoria aims to effectively contribute to the preservation of this critically endangered species while ensuring ecological balance.