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Consequently, all of the somatic cells in human females contain two X chromosomes, and all of the somatic cells in human males contain one X and one Y chromosome (Figure 3).

The same is true of all other placental mammals — males produce X and Y gametes, and females produce only X gametes (Figure 4).

In this system, referred to as the XX-XY system, maleness is determined by sperm cells that carry the Y chromosome.

", '189', ' "A Punnett diagram is represented by a diamond that has been divided into four equal square cells.

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Over time, other scientists studied the appearance of chromosomes in a wide variety of animal species, and it became clear that there was a relationship between the physical appearance and number of chromosomes in gametes and somatic cells from males and females of a given species.

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