Question

Which is the correct order in terms of largest to smallest unit?

A. A person's DNA > Chromosome > Gene > Codon
B. A person's DNA > Gene > Chromosome > Codon
C. A person's DNA > Codon > Gene > Chromosome
D. A person's DNA > Gene > Codon > Chromosome

Answer 1

A. A person's DNA > Chromosome > Gene > Codon

Step-by-step explanation:

DNA stands for deoxyribonucleic acid. It is the chemical name of the molecule making up our genes. One entire DNA molecule is called a chromosome. A normal human cell has 46 chromosomes, therefore 46 DNA molecules. We have 46 DNA molecules, but thousands of genes. Therefore, every chromosome contains many, many genes.

Think of it this way: one chromosome (one DNA molecule) is like a book and one gene is one page in the book.

Answer 2

B. A person's DNA > Gene > Chromosome > Codon is the correct order in terms of largest to the smallest unit. DNA is the largest unit, followed by genes that are segments of DNA, then chromosomes that are made of many genes, and codons that are made of three nucleotides and form a part of a gene.