HEREDITY By Jamayah Tate 502 GENES Genes are

HEREDITY By Jamayah Tate 502

GENES Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. The Human Genome Project estimated that humans have between 20, 000 and 25, 000 genes. Every person has two copies of each gene, one inherited from each parent. A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. However, many genes do not code for proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases.

This Photo by Unknown author is licensed under CC BY-SA-NC. ASEXUAL An asexual is simply someone who does not experience sexual attraction. Aces can be any sex or gender or age or ethnic background or body type, can be rich or poor, can wear any clothing style, and can be any religion or political affiliation.

PEDIGREE A pedigree shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors from one generation to the next, most commonly humans. This Photo by Unknown author is licensed under CC BY-SA. A pedigree results in the presentation of family information in the form of an easily readable chart. Pedigrees use a standardized set of symbols, squares represent males and circles represent females. Pedigree construction is a family history, and details about an earlier generation may be uncertain as memories fade. If the sex of the person is unknown a diamond is used. Someone with the phenotype in question is represented by a filled-in (darker) symbol. Heterozygotes, when identifiable, are indicated by a shade dot inside a symbol or a half-filled symbol.

Reproduction is by reproduction where both the male and female gametes fertilize to give rise to an embryo. The fertilization of human embryo occurs inside the body of the female. This Photo by Unknown author is licensed under CC BY-SA. REPRODUCTION