Multiple Choice
At which stage of meiosis is each chromosome composed of a single chromatid?
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12. Meiosis
Introduction to Meiosis
Multiple Choice
What is crossing over and during which phase of meiosis does it occur?
A
Crossing over is the exchange of genetic material between homologous chromosomes, and it occurs during prophase I.
B
Crossing over is the alignment of chromosomes at the cell equator, and it occurs during metaphase I.
C
Crossing over is the duplication of DNA, and it occurs during interphase.
D
Crossing over is the separation of sister chromatids, and it occurs during anaphase II.
Verified step by step guidance1
Understand the concept of crossing over: Crossing over is a process where homologous chromosomes exchange genetic material. This increases genetic diversity in gametes.
Identify the correct phase of meiosis: Crossing over occurs during prophase I of meiosis. This is when homologous chromosomes pair up and exchange segments.
Differentiate between phases of meiosis: Prophase I is characterized by the pairing of homologous chromosomes, while metaphase I involves alignment at the equator, and anaphase II involves separation of sister chromatids.
Clarify misconceptions: Crossing over is not related to the alignment of chromosomes at the equator (metaphase I), DNA duplication (interphase), or separation of sister chromatids (anaphase II).
Summarize the correct answer: Crossing over is the exchange of genetic material between homologous chromosomes during prophase I of meiosis, contributing to genetic variation.
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