GE-Q058: Which response best applies A-Level Biology reasoning to Use chi-squared testing to compare observed and expected phenotypic ratios. in a population bottleneck after habitat fragmentation?

GE-Q058: In the population bottleneck after habitat fragmentation, apply Use chi-squared testing to compare observed and expected phenotypic ratios.. GE-Q058: use a clear method with independent variable, dependent variable and controlled variable stated; keep control conditions constant, use random or systematic sampling with representative sample size to reduce bias, evaluate validity, reliability, accuracy, precision, uncertainty, risk and improvements, and when chi-squared is used compare the calculated value with the critical value to decide significance against the null hypothesis. Keep gene vs allele distinct: a gene is a DNA sequence at a locus, whereas an allele is a variant. Keep Hardy-Weinberg equilibrium vs natural selection distinct: Hardy-Weinberg models allele-frequency stability under assumptions, whereas natural selection changes allele frequencies when phenotype affects reproductive success.

This answer is strongest because it anchors Use chi-squared testing to compare observed and expected phenotypic ratios. to the population bottleneck after habitat fragmentation, separates biological cause from evidence, names variables and controls, uses representative sampling, and evaluates significance, uncertainty and the null hypothesis where statistics are relevant. Keep gene vs allele distinct: a gene is a DNA sequence at a locus, whereas an allele is a variant. Keep Hardy-Weinberg equilibrium vs natural selection distinct: Hardy-Weinberg models allele-frequency stability under assumptions, whereas natural selection changes allele frequencies when phenotype affects reproductive success.