AP BIOLOGY

Detailed explanation-1: -Chromosomes are thread-like or rod-shaped structures in biological organisms that carry DNA information. The two strands of a chromosome that are identical to each other are known as chromatids. Cell division is aided by chromatids, which allow cells to duplicate and replicate one other.

Detailed explanation-2: -Chromatid A chromatid is one of the two identical halves of a chromosome that has been replicated in preparation for cell division. The two “sister” chromatids are joined at a constricted region of the chromosome called the centromere.

Detailed explanation-3: -In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes.

Detailed explanation-4: -Chromosomes and cell division After chromosome condensation, the chromosomes condense to form compact structures (still made up of two chromatids). As a cell prepares to divide, it must make a copy of each of its chromosomes. The two copies of a chromosome are called sister chromatids.

Detailed explanation-5: -Chromosomes are threadlike structures made of protein and a single molecule of DNA that serve to carry the genomic information from cell to cell. In plants and animals (including humans), chromosomes reside in the nucleus of cells.