PART B – Crossing overCrossing over plays a critical role in increasing the genetic variation among offspring of sexual reproduction. It is important to understand how crossing over occurs and its consequences in meiosis. Look carefully at the diagrams depicting different stages in meiosis in a cell where 2n = 6. Assume that the red chromosomes are of maternal origin and the blue chromosomes are of paternal origin.Drag the labels to fill in the targets beneath each diagram of a cell. Note that the diagrams are in no particular order.Drag the blue labels to the blue targets to identify the stage of meiosis depicted in each diagram.Drag the pink labels to the pink targets to identify whether the configuration of the chromosomes related to crossing over is possible or not.
[Crossing over occurs during prophase I when homologous chromosomes loosely pair up along their lengths. Crossing over occurs only between nonsister chromatids within a homologous pair of chromosomes, not between the sister chromatids of a replicated chromosome. Only segments near the ends of the chromatids, not segments nearest the centromeres, can exchange DNA.]
1. What is crossing over in meiosis?
Crossing over is the exchange of genetic material between homologous chromosomes during meiosis. It occurs during the prophase I stage of meiosis and results in the creation of new combinations of alleles on the chromatids.
2. When does crossing over occur during meiosis?
Crossing over occurs during the prophase I stage of meiosis when homologous chromosomes pair up and form a tetrad.
3. What is the consequence of crossing over in meiosis?
The consequence of crossing over is the increased genetic variation among the offspring of sexual reproduction. Crossing over allows for the recombination of genetic material between homologous chromosomes, resulting in the creation of new combinations of alleles on the chromatids.
4. Can you identify the different stages of meiosis in the diagrams?
Unfortunately, I cannot see the diagrams you are referring to, but the different stages of meiosis are prophase I, metaphase I, anaphase I, telophase I, cytokinesis, prophase II, metaphase II, anaphase II, telophase II, and cytokinesis II.
5. Is the configuration of the chromosomes related to crossing over possible or not in the diagrams?
Without seeing the diagrams, I cannot determine the configuration of the chromosomes related to crossing over. However, crossing over is possible during the prophase I stage of meiosis when homologous chromosomes pair up and form a tetrad.
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