* Somatic cells are all the cells in the body that are not involved in sexual reproduction. This includes cells like skin, muscle, nerve, etc.

* Sex chromosomes are the chromosomes that determine the sex of an individual. In humans, these are X and Y chromosomes. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).

Here's why somatic cells contain sex chromosomes:

* Every cell in the body originates from a single fertilized egg. This fertilized egg contains both sets of chromosomes, including the sex chromosomes.

* During cell division (mitosis), all chromosomes are replicated and passed on to the daughter cells. This ensures that all somatic cells inherit the same genetic information, including the sex chromosomes.

Therefore, even though somatic cells do not directly participate in sexual reproduction, they still carry the genetic information that determines sex.