Sister chromatid is a technical term meaning two chromatids, each with an identical strand of coding from the same DNA, and one strand from another source, ensureing each chromatid has a double stranded DNA. Sister means each DNA has one half the coding strand from the same mother DNA source strand.
Yes, each sister chromatid does indeed contain double-stranded DNA. Sister chromatids are formed during the S phase of the cell cycle when the DNA is replicated. The DNA molecule is composed of two strands that are complementary to each other, forming a double helix structure. During DNA replication, the DNA molecule unwinds, and each strand serves as a template for the synthesis of a new complementary strand. As a result, two identical copies of the original DNA molecule are formed, with each strand of the original DNA paired with a newly synthesized strand. These two identical copies of DNA are then held together at a region called the centromere to form sister chromatids. So, each sister chromatid consists of one original DNA strand and one newly synthesized DNA strand, both of which are double-stranded.
