[haflingerfriends] Re: Genetic Definitions, part five: Heredity!.

"Heredity is the transmission of genetic information from parents to offspring through the sex cells (sperm & egg). Half of the offsprings chromosomes are from his sire, half from his dam. Therefore, he has a genotype that differs from either parent. This genotype remains unchanged throughout life, even if the phenotype (external appearance) changes somewhat, due to enviromental conditions. On rare occasions, a change may occur in the chemical composition of a gene or in the structure of a chromosome. This type of change is known as a mutation. If the change occurs in a somatic cell (sperm or egg), it can be passed on to offspring. The mutation then becomes part of the offsprings genotype and can be passed on to his progency. Although mutations are generally harmful, they can in rare instances, cause a desirable change and subsequent improvement within a species!"

Next: Environment

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