Show Answer Answer a is correct. If you answered b, you might be having some trouble keeping the beginning steps in order. If you answered c, you might be having some trouble keeping the steps in the second half of mitosis in order. Show Answer The cell shown above is in prophase. In prophase, the first step in mitosis, the nuclear envelope breaks down and chromosomes condense and become visible.
Show Answer The cell shown above is in metaphase. In metaphase, the mitotic spindle is fully developed, centrosomes are at opposite poles of the cell, and chromosomes are lined up at the metaphase plate. Show Answer This passage describes prometaphase, the second step in mitosis.
Show Answer Answer b is correct. This is one of the events that occur during anaphase. Only two pairs of chromosomes are shown in the diagrams below.
There are 23 pairs of chromosomes in a diploid human body cell. The stages of mitosis in detail Mitosis is a type of cell division in which a diploid body cell copies itself and finally divides into two identical diploid daughter cells. The stages of the cell cycle are: Stage What happens Interphase The cell spends most of its life in this phase. The DNA in chromosomes copies itself ready for mitosis.
Prophase The DNA in chromosomes and their copies condenses to become more visible. The membrane around the nucleus disappears. Hagstrom, K. Condensin and cohesin: More than chromosome compactor and glue. Nature Reviews Genetics 4 , — doi Hirano, T. At the heart of the chromosome: SMC proteins in action. Nature Reviews Molecular Cell Biology 7 , — doi Mitchison, T. Mitosis: A history of division. Nature Cell Biology 3 , E17—E21 doi Paweletz, N. Walther Flemming: Pioneer of mitosis research. Nature Reviews Molecular Cell Biology 2 , 72—75 doi Satzinger, H.
Theodor and Marcella Boveri: Chromosomes and cytoplasm in heredity and development. Nature Reviews Genetics 9 , — doi Chromosome Mapping: Idiograms. Human Chromosome Translocations and Cancer. Karyotyping for Chromosomal Abnormalities. Prenatal Screen Detects Fetal Abnormalities. Synteny: Inferring Ancestral Genomes.
Telomeres of Human Chromosomes. Chromosomal Abnormalities: Aneuploidies. Chromosome Abnormalities and Cancer Cytogenetics. Copy Number Variation and Human Disease. Genetic Recombination. Human Chromosome Number. Trisomy 21 Causes Down Syndrome. X Chromosome: X Inactivation. Chromosome Theory and the Castle and Morgan Debate. Developing the Chromosome Theory.
Meiosis, Genetic Recombination, and Sexual Reproduction. Mitosis and Cell Division. Genetic Mechanisms of Sex Determination. Sex Chromosomes and Sex Determination. Sex Chromosomes in Mammals: X Inactivation. Sex Determination in Honeybees. Citation: O'Connor, C. Nature Education 1 1 The five phases of mitosis and cell division tightly coordinate the movements of hundreds of proteins.
How did early biologists unravel this complex dance of chromosomes? Aa Aa Aa. Mitosis Occupies a Portion of the Cell Cycle. Figure 2. Figure 1. Figure Detail. Figure 3. Ascaris megalocephala bivalens, as drawn by Boveri in The figure shows chromosomes in the middle of the dividing cell, as well as the spindle, two centrosomes, and two centrioles within each centrosome.
Note that the cytoplasm is perceived as being structured. Figure 6. Figure 5. Figure 7. Figure 8. Figure Telophase and Cytokinesis. References and Recommended Reading Cheeseman, I. Article History Close. Share Cancel.
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