Biology 9700/52 March 2024 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of osmosis in onions using sodium chloride solutions of varying concentrations, focusing on changes in mass to assess water potential equilibrium.

2. Exploration of temperature effects on osmosis rates in turnip blocks, emphasizing procedural design, control variables, and safety precautions.

3. Genetics of eye color in Drosophila melanogaster, analyzing phenotypic ratios from a dihybrid cross to test for independent assortment using the chi-squared test.

4. Chromatographic analysis of fruit fly pigments to identify the chemical composition of eye colors, supported by Rf value calculations.

5. Linkage between eye pigment synthesis and organelle carrier proteins encoded by genes B/b and R/r, influencing the phenotypic expression of ommochrome and drosopterin.

6. Evaluation of experimental conclusions on genetic inheritance patterns and pigment composition, integrating results from breeding experiments and chromatography.