A gene in a leaf-cutting ant controls the production of the enzyme malate dehydrogenase (MDH) - VCE - SSCE Biology - Question 18 - 2011 - Paper 1

Given that both alleles M^1 and M^2 produce an equal amount of MDH when activated, the expected pattern of MDH production among the genotypes would show that both homozygous genotypes (M^1M^1 and M^2M^2) would produce equal amounts of MDH. The heterozygous genotype (M^1M^2) would also produce the same amount of MDH due to the equal contribution from both alleles. Therefore, the graph that best represents this scenario would show equal bars for all three genotypes. After evaluating the options, graph A represents this scenario accurately.