Crossing over Original Scenario-Based Download PDF

Questions

1. 1.

   While cultivating bioluminescent starlight-ferns in an orbital arboretum, an exobiologist traces two linked genes located on the same autosome: one determining frond glow (G or g) and the other leaf shape (S or s). A parent fern possessing the homologous pairing G–S on one chromosome and g–s on its homolog unexpectedly yields haploid spores with G–s and g–S genotypes. Which cellular event during meiosis directly accounts for the formation of these novel allele combinations?

   • A) Independent assortment of non-homologous chromosomes along the metaphase plate
   • B) Random fertilization uniting two genetically distinct haploid gametes
   • C) Semiconservative replication producing sister chromatids during interphase
   • D) Reciprocal exchange of genetic segments between non-sister chromatids of homologous chromosomes during prophase I