Chromosomes

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 Jack Jumper Ant or Myrmecia pilosula, has only two chromosomes. 2 for females, males are haploid and thus have 1; smallest number possible. Other ant species have more chromosomes.

The African Collared Dove, has 78 chromosomes.

Goldfish, have 94 chromosomes.

A dog, or Canis lupus familiaris, has 78 chromosomes, 76 autosomal and 2 sexual.

Tobacco, or Nicotiana tabacum, has 48 chromosomes. also the cultivated species is a tetraploid.