2010
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4 days ago · Mutation, an alteration in the genetic material (the genome) of a cell of a living organism or of a virus that is more or less permanent and that can be transmitted to the cell’s or the virus’s descendants. The genomes of organisms are all composed of DNA, whereas viral genomes can be of DNA or RNA.
4 days ago · Gene therapy, introduction of a normal gene into an individual’s genome in order to repair a mutation that causes a genetic disease. Human gene therapy has been attempted on somatic (body) cells for diseases such as cystic fibrosis and cancer.
2 days ago · In biology, the word gene has two meanings. The Mendelian gene is a basic unit of heredity. The molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protein-coding genes and non-coding genes.
2 days ago · A segment of DNA that codes for the cell’s synthesis of a specific protein is called a gene. DNA replicates by separating into two single strands, each of which serves as a template for a new strand.
5 days ago · Evolutionary genetics is the study of how genetic variation leads to evolutionary change. It includes topics such as the evolution of genome structure, the genetic basis of speciation and...
4 days ago · DNA (deoxyribonucleic acid) is the nucleic acid polymer that forms the genetic code for a cell or virus. Most DNA molecules consist of two polymers (double-stranded) of four nucleotides that each...
3 days ago · An allele is one of two or more alternative forms of a gene, and they are found at the same place, or locus, on the chromosome. Heterozygous refers to having different alleles for a particular trait. If the two versions are different, you have a heterozygous genotype for that gene.
