Anaphase I - Crossing-over and Independent assortment...

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Anaphase I Anaphase I begins when homologous chromosomes separate. Telophase I The nuclear envelope reforms and nucleoli reappear. This stage is absent in some species. Interkinesis Interkinesis is similar to interphase except DNA synthesis does not occur. The events that occur during meiosis II are similar to mitosis. Prophase II
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Metaphase II Anaphase II Telophase II Daughter Cells Review Use the diagram below to answer the following questions. The questions pertain only to the chromosomes. How does cell "a" differ from "b" in the diagram below? How does "b" differ from "c"?
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How does "b" differ from "d"? How does "d" differ from "e"? How does "e" differ from "f"? Variation Sexual reproduction promotes variation because each gamete (sperm or egg) contains a mixture of genes from two different parents.
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Unformatted text preview: Crossing-over and Independent assortment promote variation. During prophase of meiosis, crossing-over results in chromosomes that have some genes from one parent and some genes from the other parent. Individuals contain two sets of each chromosome but gametes contain only one set. For each homologous pair of chromosomes, one chromosome will be randomly selected for each gamete formed ( independent assortment ). Variation is necessary for natural selection . Recall that natural selection favors individuals with characteristics that are best adapted to their environments. Variation is therefore necessary for species to become adapted to their environment and it enables them to change when the environment changes....
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Anaphase I - Crossing-over and Independent assortment...

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