So we have chromosome pair number one, chromosome pair number two, chromosome pair number three, all the way to chromosome pair number 22. And all of these chromosome pairs, one through 22, are known as autosomal homologous chromosome pairs. The final chromosome pair, the 23rd one, is called the sex homologous chromosome pair. Now, in males, in normal males, we have one X sex chromosome and one Y sex chromosome. And in normal females, we have one X and the other one is also an X. So notice that because each one of these pairs consist of two individual chromosomes, that means on the normal conditions, we have two multiplied by 23 or 46 individual chromosomes within the human carotype.