Discuss the genetic factors affecting growth.

Growth is a dominant biological activity during the first two decades or so of human life, including, of course nine months of prenatal life. Growth  is an increase in the size of the body as a whole or the size attained by specific partsof the body. It is a fundamental characteristic of  all living organisms. Growth isa form of motion. Growth means the increase in the size of the various parts andorgans of the body by multiplication of cells and intercellular components during the period commencing from fertilization to physical maturity. Changesin size are outcomes of three underlying cellular processes: (a) an increase incell number or hyperplasia; (b) an increase in cell size or hypertrophy; (c) anincrease in intercellular substances or accretion. Hyperplasia, hypertrophy and accretion all occur during growth, but the predominance of one or another process varies with age and the tissue involved. The increase in number is a function of cell division (mitosis), which involves the  replication of DNA and the subsequent migration of the replicated chromosomes into functional and identical cells.

Factors Affecting Growth And Development

The integrated nature of growth and maturation is largely maintained by a constant interaction of genes, hormones, nutrients and other factors.  Thesefactors _________ ____ ________ ________ _______.
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