Multiple Choice
In animals, which type of cells undergo meiosis to produce gametes?
26
views
9. Mitosis and Meiosis
Meiosis
Multiple Choice
During prophase I of meiosis, which key event occurs that increases genetic variation?
A
The nuclear envelope reforms and chromosomes decondense
B
DNA replication occurs to produce identical sister chromatids
C
Sister chromatids separate and move to opposite poles of the cell
D
Homologous chromosomes pair (synapsis) and exchange segments by crossing over at chiasmata
Verified step by step guidance1
Identify the stage of meiosis being discussed, which is prophase I, and recall the major events that characterize this phase.
Understand that during prophase I, homologous chromosomes come together in a process called synapsis, forming pairs known as tetrads.
Recognize that crossing over occurs at points called chiasmata, where homologous chromosomes exchange genetic segments, increasing genetic variation.
Note that this exchange of genetic material results in new combinations of alleles on each chromosome, contributing to genetic diversity in gametes.
Distinguish this event from other processes such as DNA replication (which occurs before meiosis) and the separation of sister chromatids (which happens later in meiosis).
Related Videos
Related Practice
