If we were attempting to determine how much of Leanne’s personality is due to genetics and how much is due to the environment, we would

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When scientists try to disentangle genetic and environmental contributions to personality, they look for patterns of similarity between relatives who share different amounts of genes and environment. The options can be evaluated one by one.
Option A: 'measure Leanne’s genome.' While sequencing the genome reveals genetic variants, it by itself does not quantify how much personality is due to genetics versus environment. It ignores environmental exposure and gene–environment interactions, so this approach alone is insufficient for the inheritance question.
Option B: 'compare Leanne to her siblings.' This is a classic method for estimating heritability because siblings share about 50% of their segregating genes on average and often share a similar home environment. Differences and similarities among siblings can illuminate genetic versus environmental contributions, making this a sensible approach.
Option C: 'compare Leanne to both her parents.' Parents share more genetic material with Leanne than most other individuals, but this comparison can be informative only for certain inheritance patterns and doesn’t provide a clean separation of shared environment versus genetics across generations in the same way that sibling comparisons do. It’s less robust for disentangling the two sources of influence.
Option D: 'map her chromosomes.' Chromosome mapping is a structural/genomic endeavor that identifies locations of genes but does not directly measure how much of personality is due to heredity versus environment. It lacks the comparative design needed to partition variance into genetic and environmental components.
Option E: 'be asking an impossible question.' This statement would reflect a philosophical stance rather than a methodological one. In practice, researchers use designs like twin studies, adoption studies, and sibling comparisons to estimate genetic and environmental contributions, so it is not inherently impossible to investigate the question.
In sum, the reasoning hinges on using relational data within families to tease apart genetic and environmental effects, and among the listed options, comparing to siblings aligns with that established approach.

If we were attempting to determine how much of Leanne’s personality is due to genetics and how much is due to the environment, we wouldSingle choice

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