Chromosomes are double stranded in Prophase and metaphase and single stranded in anaphase and telophase.
At what stages of mitosis are the chromosomes double stranded?
Recall that DNA is replicated during the S phase of the cell cycle. Thus during metaphase of mitosis, each chromosome (i.e., each chromatid pair) will contain two molecules of double stranded DNA (one molecule per sister chromatid).
Which phases of meiosis have double stranded chromosomes?
Science – Chapter 4
|zygote||the cell formed from fertilization|
|meiosis I||same step as mitosis (prophase I, metaphase I, anaphase I, telophase I) each chromosome pair is double stranded|
|meiosis II||prophase II, metaphase II, anaphase II, telophase II|
|prohase II||double stranded chromosomes and spindle fibers reappear|
What stage is chromosome double?
A quick tip: notice that during the stages of meiosis and mitosis, the chromatid count never changes. Only the number of chromosomes changes (by doubling) during anaphase when sister chromatids are separated.
What happens to the double stranded chromosomes during meiosis?
Terms in this set (14)
each centromere divides. Two strands of each chromosome separate. Separate strands begin to move away from each other towards opposite ends of the cell. … double stranded chromosomes separate from its matching chromosome, each is pulled to opposite ends of the cell.
Why are chromosomes visible during mitosis?
Chromosomes become visible during mitosis because they condense themselves to thick, visible strands. Regularly, they are more spread out as thin strands and therefore invisible to the eye even with a microscope.
Why do chromosomes double during mitosis?
The unzipped DNA half strand is then matched up with a newly formed half strand. Because both halves receive a new half strand, the cell ends up with a double set of chromosomes.
What do you notice about the size of the two resulting cells?
What do you notice about the size of the two resulting cells? They are different sizes, one is bigger than the other. Result is 2 identical cells with 46 chromosomes.