Genetic variation Original Scenario-Based Practice

Questions

1. 1.

   In an orbital botanical sanctuary, geneticists breed a newly discovered strain of bioluminescent moss beetles, Chroma scutellata, from a parental generation of uniform heterozygotes. Under strict mutation-free conditions, the researchers observe that offspring consistently inherit novel combinations of linked traits that were not present on any single intact parental chromosome. Cytological tracking reveals that physical segments of maternal and paternal DNA molecules are systematically exchanged during gametogenesis. Which event during meiosis is directly responsible for generating these recombinant chromatids with novel allele arrangements?

   • A) The independent assortment and random orientation of non-homologous pairs along the equatorial plane during metaphase II
   • B) The condensation of chromatin fibers and dissolution of the nuclear envelope during prophase II
   • C) The reciprocal exchange of genetic material between non-sister chromatids of homologous chromosomes during prophase I
   • D) The semiconservative replication of homologous DNA segments during an interphase preceding meiosis II

Answers and step-by-step solutions appear after you finish the test.