
Concept explainers
A pair of homologous chromosomes in Drosophila has the following content (single letters represent genes):
a. What term best describes this situation?
b. Diagram the pairing of these homologous chromosomes in prophase I.
c. What terms best describes the unusual structure that forms during pairing of these chromosomes?
d. How does the pairing diagrammed in part (b) differ from the pairing of chromosomes in an inversion heterozygote?

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