安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Mutation | Definition, Causes, Types, Facts | Britannica
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; see heredity: The physical basis of heredity )
- Mutation
A mutation is a change in a DNA sequence Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses
- Mutation
Mutations occur throughout the natural world Some mutations are beneficial and increase the possibility that an organism will thrive and pass on its genes to the next generation When mutations improve survival or reproduction, the process of natural selection will cause the mutation to become more common over time
- Genetic Mutation: Definition, Types, Functions, More - Health
Some mutations are present from birth You can inherit some gene mutations that first occurred in one of your parents, grandparents, or an older ancestor Other genetic mutations happen as a
- Mutation - Definition and Examples - Biology Online Dictionary
A mutation is a change in the nucleotide sequence of a gene or a chromosome Based on the effect of mutation on the gene structure, mutations are (1) small-scale or (2) large-scale Small-scale mutations are a type of mutation where one or a few nucleotides of a gene are affected
- Mutation – Types, Causes, Mechanisms, Agents, Importance
Mutations can be categorized broadly into two types: gene mutations and chromosome mutations Gene mutations involve changes in the nucleotide sequence of a gene, affecting its allele Chromosome mutations, on the other hand, involve alterations in chromosome structure, including changes to chromosome segments, whole chromosomes, or even entire
- Types of mutations - Understanding Evolution
There are many different ways that DNA can be changed, resulting in different types of mutation Here is a quick summary of a few of these: A substitution is a mutation that exchanges one base for another (i e , a change in a single “chemical letter” such as switching an A to a G) Such a substitution could:
|
|
|