A common feature of organisms is that offspring tend to look like their parents. For example, tall, brown-eyed parents tend to have tall, brown-eyed children. The mechanism by which parents pass on particular traits to their offspring is termed...
Although Wilhelm Johannsen coined the term "gene" in 1909, our understanding of the nature of the gene has changed significantly over the course of the twentieth century. Gregor Mendel's elements of inheritance were given a...
Gene discovery is the process of identifying genes that contribute to the development of a trait or phenotype. Researchers often try to discover the genes that are involved in specific diseases. They also try to find the genes that contribute to many...
Genes are functional units of DNA that contain the instructions for making proteins or RNA. Genes also act as units of heredity, transferring the same instructions from parent to offspring. The nature, structure, and regulation of genes has been a...
A gene is the fundamental physical and functional unit of heredity. Whether in a microorganism or in a human cell, a gene is an individual element of an organism's genome and determines a trait or characteristic by regulating biochemical structure or...
A gene is the fundamental physical and functional unit of heredity. It is an individual element of an organism's genome and determines a trait or characteristic by regulating biochemical structure or metabolic process. Genes are segments of nucleic...
A linear segment of DEOXYRIBONUCLEIC ACID (DNA) containing a unique series of NUCLEOTIDES, which codes for the sequences of AMINO ACIDS in the PROTEINS required for CELL function. Genes are inherited by successive generations of cells and organisms,...
Genes are the physical units of heredity and are located along each chromosome in the cells of the human body. For each physical trait--eye color, height, hair color--a person inherits two genes or two groups of genes, one from each parent. Because...
Genes are the physical units of heredity and are located along each chromosome in the cells of the human body. For each physical trait--eye color, height, hair color--a person inherits two genes or two groups of genes, one from each parent. Because...
Genes are the physical units of heredity and are located along each chromosome in the cells of the human body. For each physical trait--eye color, height, hair color--a person inherits two genes or two groups of genes, one from each parent. Because...
Gene theory is the idea that genes are the unit of inheritance. This theory has been modified many times over the years, as new evidence has become available. In the nineteenth century, Gregor Mendel, an Austrian monk, studied peas and how certain...
Restriction enzymes selectively cut DNA. The sites at which restriction enzymes act are called cutting sites or restriction sites. The first restriction enzyme, isolated from the bacterium Haemophilus influenzae in 1968, was called HindIII (restriction...
Genes that code for vital cellular functions are highly conserved through evolutionary time, and because even these genes experience random changes over time, the comparison of such genes allows the relatedness of different organisms to be assessed....
A genetic system is how the genetic material of a given species is organized and transmitted. It is the arrangement of the inheritable material within an organism, and how that material is transmitted to the next generation. With all eukaryotic...
A gene is a unit of heredity that confers some trait or function on the organism. Most genes are thought to be essential to development and normal functioning. Genes are often a primary determinant of interpersonal differences; for example, they...
A measure of the commonness of an allele in a population; the proportion of all alleles of that gene in the population that are of this specific type. FIGURE G.3 Gastric ulcer extending deep into the inner lining and wall of the stomach. (Courtesy of...
One of a series of units contained within a cell that together comprise the CHROMOSOME. Each gene is self-reproducible when cells divide and each carries a specific encoded instruction for the development of a particular characteristic of the body,...
The fundamental physical and functional unit of heredity that carries information from one generation to the next; a segment of DNA composed of a transcribed region and a regulatory sequence that makes transcription...
Aliele One of a pair of genes. Genes are arranged in pairs, and each pair influences a specific trait. Alieles are the pairs of genes that control or determine specific traits, such as hair color. See...
