Match the words. There are three phases of evolution expressed in the modern theory of evolution. First, genetic variation is produced at three levels. At the level of DNA,________ is a chemical change in the DNA molecule, which gives rise to variation. At the level of the individual organism, __________ gives rise to variation during the formation of gamete cells. At the level of the population, migration gives rise to variation. Second, there is a reduction of genetic variation by two processes. One process,_________ is the chance (or random) removal of genetic variants due to sampling error from generation to generation. It is especially effective in small populations. The other process, _________, eliminates the less fit variants (such as those less successful at avoiding predators or finding food). meiosis reproductive isolation genetic drift natural selection gene mutation
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
Match the words.
There are three phases of evolution expressed in the modern theory of evolution. First,
- meiosis
- reproductive isolation
- genetic drift
- natural selection
- gene mutation
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
