Determined By Your Chromsomes

The last pairs of chromosomes are responsible for determining what gender a person will be. These are called sex chromosomes. A female's chromosomes are called X chromosomes. She has the genotype XX. A male's chromosomes are called Y chromosomes. He has the genotype XY. How many times do I have to freaking tell you? The last pair of chromosomes, the sex chromosomes, are responsible for determining what gender you are! You've either got the genotype XX, or the genotype XY. There's nothing outside or in between. Don't complicate things! Genotype is the genetic makeup of an organism, or the complete set of genes it inherits from its parents. It can also refer to the two alleles present at a specific locus in the genome.