Y Figure 12.5 Chromosome duplication and distribution during cell division. Chromosomal DNA molecules Chromosomes One of the multiple chromosomes in a eukaryotic cellis represented here, not yet duplicated. Normally it would be a long, thin chromatin fiber containing one DNA molecule and associated proteins; here its condensed form is shown for illustration purposes only Centromere Chromosome am Chromosome duplication (including DNA replication) and condensation O Once duplicated, a chromosome consists of two sister chroma- tids connected along their entire lengths by sister chromatid cohesion. Each chromatid contains a copy of the DNA malecule. Sister chromatids Separation of sister chromatids into two chromosomes O Molecular and mechanical processes separate the sister chromatids into two chromosomes and distribute them to two daughter cells. O How many chromatid ams does the chromasome in e nave? kdantiy the point in the figure whare one chromosome becomes two

Y Figure 12.5 Chromosome duplication and distribution during cell division. Chromosomal DNA molecules Chromosomes One of the multiple chromosomes in a eukaryotic cellis represented here, not yet duplicated. Normally it would be a long, thin chromatin fiber containing one DNA molecule and associated proteins; here its condensed form is shown for illustration purposes only Centromere Chromosome am Chromosome duplication (including DNA replication) and condensation O Once duplicated, a chromosome consists of two sister chroma- tids connected along their entire lengths by sister chromatid cohesion. Each chromatid contains a copy of the DNA malecule. Sister chromatids Separation of sister chromatids into two chromosomes O Molecular and mechanical processes separate the sister chromatids into two chromosomes and distribute them to two daughter cells. O How many chromatid ams does the chromasome in e nave? kdantiy the point in the figure whare one chromosome becomes two

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 1ACQ: Figure 6.4 Which of the following is the correct order of events in mitosis? a. Sister chromatids...

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Indicate the stage of mitosis (interphase = I, prophase = P, metaphase = M, anaphase = A, telophase = T) during which each of the following events occur. chromatid doublets separate to individual chromosomescentriole replicatesreplicated chromosomes (chromatid doublets) are arranged in single file next to one another at the cell's equatornuclear membrane is disappearingspindle fibers form and become visiblecell plate (plant) or cleavage furrow (animal) forms and is visiblechromosomes are at opposite poles of the cell; cytokinesis is almost completedchromosomes (chromatids) first become visible as long thin strandsDNA (chromosome) replication occurs
Which phase is described below? The chromosomes condense, Each is made of two sister chromatids,(looks) like an "X" Each sister is a clone, the closest of kin, And acentromere connects them like siamese twinsThe nucleolus disappears it melts away, as the cell takes a ribosomeproduction holiday, the centrosomes separate, start spindle formationfor separating chromatids and cell elongation.
Across framework for chromosome movement during cell division 2. 4 5. 19.) the stage of cell division in which the cytoplasm divides to form two daughter cells 10 20.) chromosomes that are similar in. morphology and genetic constitution 11 12 14 Down 13 14.) repeating units of chromatin structure, each consisting of a length of DNA wound around a complex of eight histone molecules 15 16 17 18 19 17.) The division of the cell nucleus resulting in two daughter nuclei, each with the same 20
Define the following terms: a. chromosome b. chromatin
Figure 6.4 Which of the following is the correct order of events in mitosis? a. Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the initotic spindle. The nucleus re-forms and the cell divides. The sister chromatids separate. b. The kinetochore becomes attached to the mitotic spindle. The sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus re-forms and the cell divides. c. The kinetochore becomes attached to metaphase plate. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus re-forms and the cell divides. d. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. The kinetochore breaks apart and the sister chromatids separate. The nucleus re-forms and the cell divides.
Discuss the levels of chromosomal organization with reference to the following terms: a. nucleotide b. DNA double helix c. histones d. nucleosomes e. chromatin
The mitotic spindles arise from which cell structure? centromere centroscme kinetochore cleavage furrow
The structure that gives terminal : stability of chromosomes is Kintochore O Centromere and telomeres Centromere O telomere O
With regard to thickness and length, what do you think chromosomes would look like if you microscopically examined them during interphase? How would that compare with their appearanceduring metaphase?
Beginning with the G1 phase of the cell cycle, describe the levelof compaction of the eukaryotic chromosome. How does thelevel of compaction change as the cell progresses through thecell cycle? Why is it necessary to further compact the chromatinduring mitosis?
Across framework for chrom 11 osome movement during cell division 14 15 17 19.) the stage of çell division in which the cytoplasm divides to fórm two daughter cells 8. 9- 10 20.) chromosomes that are similar in morphology and genetic costitution 11 12 13 14 Down 15 16 14.) repeating units of chromatin structure, each consisting of a length of DNA wound around a complex of eight histone molecules 17 18 19 20 17.) The division of the cell nucleus resulting in two daughter nuclel, each with the same
HOW DO WE KNOW? how chromosomes are distributed during cell division, both in dividing somatic cells (mitosis) and in gamete- and spore-forming cells (meiosis). We found many opportunities to consider the methods and reasoning by which much of this information was acquired. How do we know that mitotic chromosomes are derivedfrom chromatin?