The same chromosome can look very different depending on when in meiosis it is observed. Explain fully why this is so and also why the chromosome is less condensed during some parts of the cell cycle? How many DNA molecules does each chromosome contain at the beginning of Prophase I? Use the following terms in your explanation: chromatin, histone, chromatid, centromere.

The same chromosome can look very different depending on when in meiosis it is observed. Explain fully why this is so and also why the chromosome is less condensed during some parts of the cell cycle? How many DNA molecules does each chromosome contain at the beginning of Prophase I? Use the following terms in your explanation: chromatin, histone, chromatid, centromere.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter6: Reproduction At The Cellular Level

Section: Chapter Questions

Problem 6RQ: The individual chromosomes become visible with a light microscope during which stage of mitosis? a....

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In the cell cycle, at which stages do two chromatids make up one chromosome? a. beginning of mitosis b. end of G1 c. beginning of S d. end of mitosis e. beginning of G2
Figure 10.6 Which of the following is the correct order of events in mitosis? Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the mitotic spindle. The nucleus reforms and the cell divides. Cohesin proteins break down and the sister chromatids separate. The kinetochore becomes attached to the mitotic spindle. Cohesin proteins break down and the sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus reforms and the cell divides. The kinetochore becomes attached to the cohesin proteins. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus reforms and the cell divides. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. Cohesin proteins break down and the sister chromatids separate. The nucleus reforms and the cell divides.
The individual chromosomes become visible with a light microscope during which stage of mitosis? a. prophase b. prometaphase c. metaphase d. anaphase
Chromosome structure can change during the cell cycle. Which one of the following entries most accurately describes the time during which chromosome structure goes from being comprised of one chromatid to two chromatids? During G1 During S During G2 During M
A somatic cell has 46 chromosomes aligned at metaphase. How many chromosomes are present at anaphase, immediately after the centromeres have split?
For an organism with 3 pairs of chromosomes (6 total chromosomes, 2n = 6), draw chromosome diagrams for the following phases of the mitotic cell cycle: G1 of interphase, prophase, metaphase, anaphase & telophase. Be sure to draw the correct number of chromosomes and the correct number of chromatids per chromosome. Use a different color to represent each chromosome type (for example, use blue to indicate all copies of chromosome 1, red for all copies of chromosome 2, & green for all copies of chromosome 3).
The phases of mitosis are shown in Figure 6.4. Mitosis is the type of nuclear division that occurs when an animal or plant grows larger and when injury heals. Two daughter cells result because there is only one round of division, and it keeps the chromosome number constant (same as the parent cell). The prophase cell in Figure 6.4 has the same number of chromosomes as the telophase nuclei in Figure 6.4. Explain the different appearance of the chromosomes.
List three ways in which mitosis differs from meiosos. Be specific
List in each blank the description of events associated with each stage of mitosis in addition to the preparatory stage Interphase. Some events and structures occur only in plant cells and some in animal cells. Mark these events in the list with an asterisk.
A eukaryotic cell is diploid and contains 10 chromosomes (5 ineach set). In mitosis and meiosis, how many daughter cells will beproduced, and how many chromosomes will each one contain?
Can be more than one answer: Select all of the following that are true of MEIOSIS but not of MITOSIS. a) cell division occurs during cytokinesis b) results in two identical daughter cells c) halves the number of chromosomes in a cell d) spindle fibers contract during anaphase e) tetrads line up on metaphase plate
Imagine a nucleus that has 10 chromosomes. How many chromosomes does it have before prophase begins? How many chromosomes does each daughter nucleus have after telophase has been completed? How many chromatids are present in the one mother nucleus before prophase begins? How many chromatids are present in each daughter nucleus after telophase has been completed? How many chromatids are present if you add together all chromatids in both daughter nuclei after telophase has been completed?