Y

Y Chromosome
Y Chromosome is one of the two sex chromosomes, X and Y. Humans and other mammals have these two sex chromosomes.

Females have two X chromosomes in their cells, while males have X and Y chromosomes in their cells.

Female egg cells contain an X chromosome, while male sperm cells contain an X or a Y chromosome. This arrangement means that during fertilization, it is the male that determines the sex of the offspring.

Yin and Yang
In Chinese philosophy, yin and yang are opposite forces that form a whole. Everything contains both yin and yang in a balance that is always changing, such as hot and cold, day and night, and health and disease. In traditional Chinese medicine, disease is diagnosed and treated based on the balance of yin and yang. Good health is believed to come from a balance of Yin – negative, dark, and feminine – and Yang – positive, bright, and masculine.