Chromosome — Science definition

One very long DNA molecule packaged with proteins so it can be handled during division; humans have 46, in 23 pairs.

Where it is taught

In use

A chromosome is a very long DNA molecule packaged with proteins into a structure compact enough to be handled during cell division, and it carries hundreds or thousands of genes along its length.

DNA, Genes & Chromosomes

Questions using chromosome

Problem 1

Is a gene normally a whole chromosome?
Answer and explanation

No. A gene is a region of genetic material; a chromosome contains many regions and other DNA.

Problem 2

Illustrative draft places a chromosome inside one gene and says every body cell with the same DNA performs the same task. Repair the nested relationship and explain cell specialization without inventing separate inherited genomes for every cell type.
Answer and explanation

Gene regions are parts of chromosome DNA, not containers for whole chromosomes. Cells with broadly similar genetic information can use different portions and develop different structures and roles. The model does not show every gene, product, or interaction, so a shared genome does not imply identical activity in all cells.

Place gene regions along chromosome DNA.

Connect information use with functional products.

Distinguish shared information from identical activity.

Response criteria

  • Explain the relevant biological process accurately.
  • Use the supplied evidence and show calculation steps with units where needed.
  • Connect a labeled model or mechanism with the claim.
  • State an assumption, evidence limitation, or useful next observation.

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