Prenatal Growth and Development

A person’s unique genetic blue print is contained in the 23 pairs of chromosomes found in every body cell. Conventionally, chromosomes are numbered from 1 to 22 according to their size in descending (large to small). The first pair is the largest. The 23rd pair determines a person’s sex. An XX combination indicates a female and an XY combination a male.

what are the principles of growth and development

Principles are laws or rules in human growth and development they are the general patterns that hold in describing the way human beings develops.