C3 - C1. They are genetically identical, barring rare...

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C1. They are genetically identical, barring rare mutations, because they receive identical copies of the genetic material from the mother cell. C2. The term homologue refers to the members of a chromosome pair. Homologues are usually the same size and carry the same types and order of genes. They may differ in that the genes they carry may be different alleles. C3. Sister chromatids are identical copies derived from the replication of a parental chromosome. They remain attached to each other at the centromere. They are genetically identical, barring rare mutations and crossing over with homologous chromosomes. C4. Metaphase is the organization phase and anaphase is the separation phase. C5. In G 1 , there should be six linear chromosomes. In G 2 , there should be 12 chromatids that are attached to each other in pairs of sister chromatids. C6. In metaphase I of meiosis, each pair of chromatids is attached to only one pole via the kinetochore microtubules. In metaphase of mitosis, there are two attachments (i.e., to both poles). If the attachment was lost, a chromosome would probably be lost and degraded because it would not migrate to a pole. Therefore, it would not become enclosed in a nuclear membrane after telophase. If left out in the cytoplasm, it would eventually be degraded. C7. A. During mitosis and meiosis II B. During meiosis I C. During mitosis, meiosis I, and meiosis II D. During mitosis and meiosis II C8. The reduction occurs because there is a single DNA replication event but two cell divisions. Because of the nature of separation during anaphase I, each cell receives one copy of each type of chromosome. C9. C10. It means that the arrangement of the maternally derived and paternally derived chromosomes is random during metaphase I. Refer to Figure 3.17. C11. Mitosis—two diploid cells containing 10 chromosomes each (two complete sets) Meiosis—four haploid cells containing 5 chromosomes each (one complete set) C12. There are three pairs of chromosomes. So the possible number of arrangements equals 2 3 , which is 8. C13. (1/2) n = (1/2) 4 = 1/16 C14. It would be much lower because pieces of maternal chromosomes would be mixed with the paternal chromosomes. Therefore, it is unlikely to inherit a chromosome that was completely paternally derived. C15. Bacteria do not need to sort their chromosomes because they only have one type of chromosome. The attachment of the two copies of the chromosomes to the cell membrane prior to cell division ensures that each daughter cell receives one copy.
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C16. During interphase, the chromosomes are greatly extended. In this conformation, they might get tangled up with
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This note was uploaded on 04/07/2009 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas.

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C3 - C1. They are genetically identical, barring rare...

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