Table of Contents
What begins when the single stranded chromosomes reach the poles?
Mitosis ends with telophase, or the stage at which the chromosomes reach the poles. The nuclear membrane then reforms, and the chromosomes begin to decondense into their interphase conformations.
At what stage of meiosis do single stranded chromosomes arrive at the poles of each cell?
telophase I
In telophase I, the separated chromosomes arrive at opposite poles. In some organisms, the chromosomes decondense and nuclear envelopes form around the chromatids in telophase I. Then cytokinesis, the physical separation of the cytoplasmic components into two daughter cells, occurs without reformation of the nuclei.
When in the cell cycle do single stranded chromosomes become double-stranded?
anaphase
During anaphase each chromosome present in metaphase separates into two chromosomes, each with a single double-stranded DNA molecule. Therefore, during anaphase the chromosome number is temporarily doubled until the cells finish the process of cell division.
In which two stages of mitosis are the chromosomes single stranded?
Prophase, Metaphase, Anaphase and Telophase. Chromosomes appear as long coiled structures at the beginning of prophase and appear as single-stranded. Each chromosome is actually double-stranded due to duplication of genetic material during interphase that precedes mitosis.
What phase of meiosis do chromosomes become single stranded for the first time?
-Telophase 2, when new set of single stranded chromosomes reach opposite poles and a nuclear membrane forms around each set of new chromosomes. two alleles separate during meiosis so that each gamete has only one allele for a characteristic.
What phase do chromosomes become single stranded?
Science – Chapter 4
| A | B |
|---|---|
| chromosomes | thread like structures made of chromatin that contain DNA |
| phases of mitosis | interphase, prophase, metaphase, anaphase, telophase |
| interphase | chromosomes are invisible. They copy themselves and become double stranded. A centromere holds the chromosomes together |
In which mitotic phase do single stranded chromosomes reach opposite poles of the cells?
-Telophase 2, when new set of single stranded chromosomes reach opposite poles and a nuclear membrane forms around each set of new chromosomes.
Where do chromosomes move in the cell during anaphase?
Spindle fibers (microtubules) are visible. In anaphase, the paired chromosomes (sister chromatids) separate and begin moving to opposite ends (poles) of the cell. Spindle fibers not connected to chromatids lengthen and elongate the cell. At the end of anaphase, each pole contains a complete compilation of chromosomes.
How are sister chromatids pulled toward opposite poles?
In anaphase, sister chromatids (now called chromosomes) are pulled toward opposite poles. In telophase, chromosomes arrive at opposite poles, and nuclear envelope material surrounds each set of chromosomes.
Where does the mitotic spindle attach to the chromosomes?
Mitosis: In Summary. In prophase, the nucleolus disappears and chromosomes condense and become visible. In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores. In metaphase, chromosomes are lined up and each sister chromatid is attached to a spindle fiber.
What happens to the daughter chromosomes during telophase?
The daughter chromosomes migrate centromere first and the kinetochore fibers become shorter as the chromosomes near a pole. In preparation for telophase, the two cell poles also move further apart during the course of anaphase. At the end of anaphase, each pole contains a complete compilation of chromosomes.