Mendelian and post-Mendelian genetics, molecular basis of inheritance, evolution.
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Q1 · Genetics and Evolution · EASY
A researcher studying lac operon mutants in E. coli finds a strain that cannot produce β-galactosidase even in the presence of lactose and absence of glucose. The mutation most likely occurred in which component?
Q2 · Genetics and Evolution · HARD
A researcher studying a dihybrid cross in pea plants (involving seed shape and seed color) obtained an F2 ratio of 9:3:3:1. However, in another plant species with similar traits, the F2 ratio was 9:7. What is the most likely explanation for this deviation from the expected dihybrid ratio?
Q3 · Genetics and Evolution · EASY
The lac operon in E. coli is an example of negative regulation. Which molecule acts as the inducer that inactivates the repressor protein?
Q4 · Genetics and Evolution · HARD
A dihybrid cross between two heterozygous parents (AaBb × AaBb) is performed, where genes A and B are located on different chromosomes. Assuming independent assortment and complete dominance, what fraction of the F2 offspring will display both recessive phenotypes?
Q5 · Genetics and Evolution · EASY
DNA replication in prokaryotes and eukaryotes follows the semi-conservative model. Which enzyme is primarily responsible for synthesizing new DNA strands by adding nucleotides complementary to the template strand?