Description :

Humans have 23 pairs of chromosomes for a total of 46 chromosomes in fact each species of plants and animals has a set number of chromosomes a fruit fly for example has four pairs of chromosomes while a rice plant has 12 and a dog 39 how are chromosomes inherited. In humans each cell normally contains 23 pairs of chromosomes for a total of 46 twenty two of these pairs called autosomes look the same in both males and females the 23rd pair the sex chromosomes differ between males and females females have two copies of the x chromosome while males have one x and one y chromosome. The human chromosomes are numbered 1 22 with two additional chromosomes called x and y chromosomes 1 22 occur as two copies in every somatic cell the x chromosome occurs as two copies in every female somatic cell but only once in every male somatic cell the y chromosome occurs only once in every male somatic cell