Multiple Choice
In which stage(s) of meiosis does crossing-over between homologous chromosomes normally occur?
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
Multiple Choice
During meiosis I, what are the visible crossover points between homologous chromosomes called?
A
Centromeres
B
Chiasmata
C
Synaptonemal complexes
D
Kinetochores
Verified step by step guidance1
Understand the context: During meiosis I, homologous chromosomes pair up and exchange genetic material through a process called crossing over.
Identify the structures involved: The points where crossing over occurs are visible under a microscope as specific sites where homologous chromosomes remain connected after synapsis.
Recall terminology: These visible crossover points are known as 'chiasmata' (singular: chiasma), which physically hold homologous chromosomes together until they separate.
Differentiate from other options: Centromeres are the chromosome regions where sister chromatids are joined; synaptonemal complexes are protein structures that form between homologous chromosomes during synapsis but are not the visible crossover points; kinetochores are protein complexes at centromeres where spindle fibers attach.
Conclude that the correct term for the visible crossover points between homologous chromosomes during meiosis I is 'chiasmata'.
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