How are sister chromatids formed?

Answer 1

I thought it best to copy and paste various text to help you decide which explains the term best:
Sister Chromatids (formed during interphase)
– These are joined together by a centromere
• Specific DNA sequence
• Bound to the centromere is the kinetochore
• The kinetochore is a disc of proteins which connects the centromere to the spindle fibers

Sister chromatids: The individual copies of portions of the DNA molecule formed after the chromatin condenses. During cell division, each chromosome is duplicated, and the two resulting copies segregate to different daughter cells. The two products of replication of a chromosome are called sister chromatids. Attachment of sister chromatids to the microtubules of the spindle in correct orientation requires a fine-tuned balance between two forces, one pulling the chromosomes apart and one keeping them together. The latter is called sister chromatid cohesion (SCC).

Sister chromatids are identical copies of a chromosome. Compare sister chromatids to homologous chromosomes, which are the two different copies of the same chromosome that diploid organisms (like humans) inherit, one from each parent. In other words, sister chromatids contain the same genes and same alleles, and homologous chromosomes contain the same genes but two copies of alleles, each of which might or might not be the same as each other.

A full set of sister chromatids is created during the S subphase of interphase, when all the DNA in a cell is replicated. Identical chromosome pairs are separated into two different cells during mitosis, or cellular division.

Answer 2

Sister chromatids form when they go through Synthesis Reaction or S-Phase of interphase which is basically the beginning of cell growth. Sythensis is the actual replication of DNA . BUT they are not visible until prophase; this is when the chromatin condenses and the double-stranded chromosomes or sister chromatids become visible! I don't know why one guy said anaphase; this is where the sister chromatids are pulled apart by spindle fibres to opposite poles of the cell in mitosis. Meiosis is different, they are separated in anaphase 2. Hope I helped!

Answer 3

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Sister chromatids form when they go through Synthesis Reaction or S-Phase of interphase which is basically the beginning of cell growth. Sythensis is the actual replication of DNA . BUT they are not visible until prophase; this is when the chromatin condenses and the double-stranded chromosomes or sister chromatids become visible!

Answer 4

During SYNTHESIS! :-)


Parts of the Cell Cycle
1. Interphase
a. Gap 1~ growth of the cells
1) Contact Inhibition- stops growing when touches another cell
b. Synthesis~ DNA is replicated
1) Complimentary base pairing
c. Gap 2~ replication of organelles
1) Protein synthesis
2. Mitosis
a. Prophase
1) Chromatin condenses to form chromosomes
2) Nucleus disappears
3) Centrioles migrate to poles
4) Spindle fibers develop
5) Nuclear membrane disappears
b. "Prometaphase
1) Chromosomes are migrating to the equator"
c. Metaphase
1) Spindle attaches to the kinetochores of the chromosome
2) Chromosomes are aligned on the equator
d. Anaphase (shortest)
1) Separation of sister chromatins
e. Telephase + Cytokinesis
1) Chromosomes are migrating to the poles (actin + myosin are protein that allow spindle fibers to move)
2) Nuclear membrane reforms
3) Nucleolus reforms
4) Chromosomes uncoil> chromatin

Answer 5

Sister chromatids are the two sides of a double-stranded chromosome. The chromosome is double-stranded because the DNA replicated during S phase of interphase. Sister chromatids are identical DNA molecules and are held together by a centromere.

In order for the DNA to turn from chromatin to the sister chromatids of the chromosome, the DNA molecule wraps around special protein, and continues fold around and around other proteins until it is a lot shorter and thicker. = chromosomes.

Answer 6

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RE:
How are sister chromatids formed?

Answer 7

through DNA replication i think