Multiple Choice
During Meiosis I in oogenesis, the primary oocyte divides to form a secondary oocyte and which of the following?
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12. Meiosis
Meiosis I
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Which of the following occurs during anaphase I?
A
Sister chromatids separate and migrate toward opposite poles.
B
Nuclei re-form.
C
Chromosomes line up on one plate.
D
The cell is haploid.
E
Homologs separate and migrate toward opposite poles.
Verified step by step guidance1
Understand the context of the problem: Anaphase I is a stage in meiosis, a type of cell division that reduces the chromosome number by half and results in the production of gametes or spores.
Recall the key events of anaphase I: During this phase, homologous chromosomes (homologs) are separated and pulled to opposite poles of the cell. This is different from mitosis, where sister chromatids separate.
Differentiate between homologous chromosomes and sister chromatids: Homologous chromosomes are pairs of chromosomes, one from each parent, that are similar in shape and size. Sister chromatids are identical copies of a single chromosome, connected by a centromere.
Identify the correct event for anaphase I: The separation of homologous chromosomes is the defining feature of anaphase I in meiosis, distinguishing it from the separation of sister chromatids in mitosis or anaphase II of meiosis.
Conclude that the correct answer is 'Homologs separate and migrate toward opposite poles,' as this is the characteristic event of anaphase I in meiosis.
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