The protein-coding sequences of a gene. Exonuclease An enzyme that cleaves nucleotides one at a time from an end of a polynucleotide chain. The set of correspondences between nucleotide pair triplets in DNA and amino acids in protein. A similar phenotype being caused by different mutations. Most commonly used for a similar phenotype being caused by mutations in different genes.
Allelic heterogeneity refers to different mutations in the same gene.
Genetic markers Alleles of genes, or DNA polymorphisms, used as experimental probes to keep track of an individual, a tissue, a cell, a nucleus, a chromosome, or a gene. The total genetic material of an organism, i.e. an organism's complete set of DNA sequences. Specialized cells that form the reproductive organ where they ultimately undergo meiosis, thereby producing gametes that contain half the number of chromosomes as there body cells. Germ cells are responsible for transmitting genes to the next generation of an organism. Haploid A single set of chromosomes present in the egg and sperm cells of animals, in the egg and pollen cells of plants, and in stable or transient life cycle forms of some other organisms such as yeast.