Where are sex chromosomes found in humans. Are the same DNA genes found in all the cells of a person?

Answer 1

For women, sex cells, also called eggs, are located in their 2 ovaries. For men, sex cells, also called sperm, are located in the genital area. Every cell in your body has it's own unique DNA code, and this code tells all your cells what to do and how to reproduce to make identical daughter cells (in the case of mitosis, or asexual cell reproduction).

The DNA code is the exact same throughout your entire body, however your cells also contain certain traits called alleles. Alleles are what determine things like your hair, eye, and skin color, and whether or not you have certain physical traits, such as dimples, a widow's peak, freckles, and many others.

When a female's egg is fertilized by a male's sperm, the offspring that forms gets one allele from each parent. This is why kids never look exactly like their parents, but may share traits from both of them.

For example, you may be heterozygous for brown eye color, meaning that you inherited one brown allele from one parent, and, one blue (or any eye color other than brown) allele from your other parent. Since brown eyes dominate over blue eyes, your offspring will have brown eyes.