Why do you have certain characteristics in common with your parents

Genetics (DNA)

Explanation:

Your chromosomes contain the blueprint for your body – your genes. Almost every cell in the human body contains a copy of this blueprint, mostly stored inside a special sac within the cell called the nucleus.

Chromosomes are long strands of a chemical substance called deoxyribonucleic acid (DNA).

Parents pass on traits or characteristics, such as eye color and blood type, to their children through their genes. Some health conditions and diseases can be passed on genetically too.

Each variation of a gene is called an allele (pronounced ‘AL-eel’). These two copies of the gene contained in your chromosomes influence the way your cells work.

The two alleles in a gene pair are inherited, one from each parent. Alleles interact with each other in different ways. These are called inheritance patterns. Examples of inheritance patterns include:

the answer is a or when it says crossing over