Video Transcript
Below are some structures you will
find in a human cell: one, a single gene; two, a nucleus; three, a chromosome. Order them from smallest to largest
size. (A) A chromosome is smaller than a
single gene is smaller than a nucleus. (B) A nucleus is smaller than a
chromosome is smaller than a single gene. (C) A single gene is smaller than a
chromosome is smaller than a nucleus. Or (D) a chromosome is smaller than
a nucleus is smaller than a single gene.
To answer this question, let’s look
at the organization of genetic material inside a cell. Our genetic information is located
in a molecule called DNA. DNA is a very long molecule, and it
contains different segments that code for specific characteristics like our hair
color or eye color. These segments are called
genes. Our DNA is organized into different
chromosomes. In humans, we have 46 chromosomes
in most cells of our body. Each chromosome is a tightly packed
molecule of DNA with many genes. These chromosomes are stored in the
nucleus of our cells.
So if you put it all together, the
order from smallest to largest is option (C), a single gene is smaller than a
chromosome is smaller than a nucleus.
