Olympiad-style Reasoning
Data interpretation, experimental design and concept-application questions typical of NSEB.
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Take a full mock →Q1 · Olympiad-style Reasoning · HARD
In a genetic cross involving fruit flies, 1600 offspring were obtained with the following phenotypes: 900 wild-type, 300 vestigial wings, 300 ebony body, and 100 vestigial wings with ebony body. Assuming independent assortment, what is the most likely genetic explanation?
Q2 · Olympiad-style Reasoning · MEDIUM
A bacterial culture is started with 500 cells. If the generation time is 40 minutes and no cells die, approximately how many cells will be present after 3 hours and 20 minutes?
Q3 · Olympiad-style Reasoning · MEDIUM
A plant species shows heteromorphic incompatibility where pollen from long-styled flowers can only fertilize short-styled flowers and vice versa. In a population, if the frequency of the long-style allele (S) is 0.6 and short-style allele (s) is 0.4, what percentage of crosses will be compatible?
Q4 · Olympiad-style Reasoning · HARD
An experiment monitored bacterial growth in a nutrient medium. At time t=0, there were 100 cells. After 3 hours, the population reached 12,800 cells, following exponential growth with equal generation time. What is the generation time of this bacterial culture?
Q5 · Olympiad-style Reasoning · MEDIUM
In a certain plant species, flower color is controlled by two genes. Gene A (dominant allele produces red pigment) and Gene B (dominant allele produces yellow pigment). The combination of both pigments results in orange flowers, while the absence of both pigments produces white flowers. If a dihybrid orange-flowered plant (AaBb) is self-crossed, what fraction of the F1 progeny will have white flowers?