[Campbell Biology P.352] In Figure 15.10, which meiotic event is directly responsible for pr... | Practice Question

In Figure 15.10, which meiotic event is directly responsible for producing recombinant chromosomes like b+ vg and b vg+ ?

  • A: Replication of chromosomes before meiosis I.
  • B: Crossing over between nonsister chromatids during meiosis I.
  • C: Independent assortment of homologous chromosomes at metaphase I.
  • D: Separation of sister chromatids during meiosis II.

Explanation

The diagram explicitly labels 'Meiosis I including crossing over ' and shows the physical exchange of segments between the red and pink nonsister chromatids. This exchange is what creates the recombinant chromosomes that carry new combinations of alleles b+ with vg, and b with vg+ .