Biology HSC practice questions

You need to provide specific justifications for using CRISPR-Cas9 by outlining at least two benefits, such as its precision or potential therapeutic applications. Additionally, you must discuss at least two ethical concerns associated with its use, such as off-target effects or germline editing.

Your discussion should explain how both Mendelian and non-Mendelian inheritance patterns are used in genetic counselling. For Mendelian, describe how dominant, recessive, and X-linked patterns inform risk prediction. For non-Mendelian, discuss how more complex patterns (e.g., incomplete dominance, polygenic inheritance) contribute to a more comprehensive understanding of disease inheritance. Conclude by explicitly linking this understanding to its importance for counselling and predicting disease recurrence.

Your description should explain what memory B cells are, when they are formed, and how they contribute to a quicker and more effective immune response upon re-exposure to a pathogen.

Your explanation should define the complementary base pairing rule, describe how it applies during DNA replication, and state the crucial outcome of this rule for the replication process.

Your analysis should identify and explain at least three distinct factors contributing to the emergence and re-emergence of infectious diseases. For each factor, you need to clearly describe how it facilitates the spread or evolution of pathogens in a globalised context. Consider factors like global travel, environmental changes, and human behaviour.

You need to assess the strengths of epidemiological studies in both identifying risk factors for non-infectious diseases and guiding public health interventions. You must also discuss the limitations of these studies in achieving these aims. Ensure you provide examples or specific ways in which these studies are effective or limited.

Your explanation should define independent assortment, describe when and how it occurs during meiosis, and link this process directly to the resulting increase in genetic variation in offspring.

You need to identify one similarity between point and chromosomal mutations. Then, clearly distinguish between them by describing what each type of mutation entails and how their scale and potential impact differ.

You need to identify a specific lifestyle factor and then briefly explain how it contributes to an increased risk of type 2 diabetes.

Your justification needs to thoroughly explore both the social benefits and ethical implications of genetically modified crops. You should identify and explain at least two distinct social benefits, such as increased yield or nutritional value. Simultaneously, you must discuss at least three significant ethical implications, including environmental risks, socioeconomic concerns (like seed ownership), and potential health impacts or consumer choice issues. Ensure your answer provides a balanced perspective.