Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

Question

Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

BlackTom AI · Accepted Answer

The question asks about the stage of the cell cycle when crossing over occurs, and provides two answer choices: 'prophase' and an empty option.
First, consider what crossing over is: it is the exchange of genetic material between homologous chromosomes that occurs during meiosis, not mitosis.
Option 1: 'prophase' — This is the correct stage to associate with crossing over, specifically during prophase I of meiosis when homologous chromosomes pair up (synapsis) and form the synaptonemal complex, leading to recombination events.
Option 2: '' (empty) — This option is not a valid stage of meiosis; it provides no information and cannot be considered correct because it fails to identify a real phase where crossing over happens.
In more detail, the key concept is that crossing over occurs during prophase I, particularly during the sub-stages of leptotene, zygotene, pachytene, diplotene, and diakinesis, with recombination initiating in leptotene and completing in pachytene before homologs move to metaphase I. Any answer that suggests mitotic phases (like metaphase, anaphase, or cytokinesis) would be incorrect, since crossing over is a meiotic event.
Thus, option 1 correctly identifies the stage associated with the phenomenon, while option 2 fails to provide a valid stage and thus is incorrect.

Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

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Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

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类似问题

A diploid (2n) cell undergoes meiosis. How many chromosomes will each gamete contain?

Question at position 73 Crossing over between homologous chromosomes occurs during ____ and homologous chromosomes separate from each other during ____.prophase I; anaphase IIprophase II, telophase Iprophase I; anaphase Iprophase II; telophase II

Question at position 62 If a diploid cell (2n = 16) undergoes meiosis I and II, the result is:2 cells; each with 2n = 82 cells; each with 2n = 164 cells; each with n = 84 cells; each with 2n = 322 cells; each with 2n = 32

In the ovule each megaspore mother cell undergoes _____ to produce four megaspores.

In humans, the main purpose of cell division by meiosis is

A diploid (2n) cell undergoes meiosis. How many chromosomes will each gamete contain?

更多留学生实用工具

希望你的学习变得更简单

Question at position 73 Crossing over between homologous chromosomes occurs during and homologous chromosomes separate from each other during .prophase I; anaphase IIprophase II, telophase Iprophase I; anaphase Iprophase II; telophase II