McMaster Bio 1M03 Exam Questions with 100% Correct Answers | Latest Version 2024 | Verified

Why might Pasteur's experiment be inconclusive? - The swan-necked flask broth may not support cell growth, or the broth was poisoned. Experiment did not confirm hypothesis that all cells come from pre-existing cells Why are replicates important in experiments? - To ensure that results were not achieved by random chance What is the definition of a replicate? - Unit that shares a common thing (4 mice in one cage = 1 replicate) What does the law of succession suggest? - As one species disappears, a similar one appears. Suggests ancestors and descendants What is the difference between vestigial traits and transitional features? - vestigial - useless features similar to useful features in related species (eg, coccyx in humans, tail in monkeys) transitional - intermediate feature seen in fossil species, between ancestral and descended species (eg, aquatic animal fins, tetrapod limbs) List potential outcomes of the bottleneck effect - - Potential high frequency of deleterious alleles that were previously at low frequency in source population - Different allele frequencies from source population, could lead to speciation - Strong genetic drift due to small population size Explain how the tuberculosis bacteria underwent natural selection during and after drug therapy - Variation: different strains → some resistant to drugs, some died Heritability: drug-resistant bacteria passed drug-resistant gene to daughter cells Differential fitness: bacteria that surviv