Biology 9700/52 Oct Nov 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Photosynthetic performance of unicellular algae strains compared using absorption and action spectra; light wavelength's effect on photosynthetic rates and pigment separation via two-way chromatography.

2. Variables standardized during experiments: light intensity, exposure duration, and pigment extraction for chromatography setup.

3. Identification of photosynthetic pigments by R\\(_f\\) values and wavelengths of maximum absorption; chromatogram interpretation highlights strain-specific pigment differences.

4. Genetic analysis in Drosophila melanogaster: inheritance patterns of body color and wing length, chi-squared tests to verify expected phenotypic ratios, and control variables in breeding experiments.

5. Experimental evidence supports Mendelian inheritance, while chi-squared test outcomes validate hypotheses on gene segregation.