Question

which statement about sister chromatids is true?
one sister chromatid is inherited from each parent.
sister chromatids are always in every cell.
sister chromatids are only present during cell reproduction.
each sister chromatid forms a lobe of a chromosome.

Explanation:

• Sister chromatids are formed during DNA replication in the S - phase of the cell cycle (part of cell reproduction). They are identical copies of a single chromosome.
• They are not always present in every cell. For example, in non - dividing cells (in G0 phase), sister chromatids are not present as the DNA is in a less condensed form and not replicated.
• One sister chromatid is not inherited from each parent. Homologous chromosomes (not sister chromatids) have one from each parent.
• Sister chromatids are not lobes of a chromosome. A chromosome with sister chromatids has two chromatids joined at the centromere.

Answer:

Sister chromatids are only present during cell reproduction.