Characteristics of animal and plant species can be affected by factors such as climate, diet, accidents, culture and lifestyle. For example, if you eat too much food you will gain weight, and if you eat too little you will lose weight.
Is variation caused by the environment?
Environmentally caused variations may result from one factor or the combined effects of several factors, such as climate, food supply, and actions of other organisms. Phenotypic variations also include stages in an organism’s life cycle and seasonal variations in an individual.
What are the factors causing variation?
The Genetic Variation in a Population Is Caused by Multiple…
- Mating patterns are important. …
- Random forces lead to genetic drift. …
- Distribution. …
- Migration. …
- The overall effect. …
Do environmental factors play a role in variation?
These results suggest that ecological factors can have strong impacts on both population size per se and intrapopulation genetic variation even at a small scale. On a more general level, our data indicate that a patchy environment and low dispersal rate can result in fine-scale patterns of genetic diversity.
What environmental factors can cause genetic variation?
Genetic variation is nonrandomly distributed among populations and species (Nevo, 1998), with distribution of alleles and genotypes over space and time often affected by numerous factors such as breeding system, seed dormancy and dispersal mechanism, geographic variation and range, life span and other life‐history …
Can variation be genetic and environmental?
Characteristics in an individual organism are caused by both genetic and environmental variation. For example, the weight of a dog is caused partly by its genes – inherited – and partly by what it eats – environmental.
What are environmental factors?
Environmental factors include temperature, food, pollutants, population density, sound, light, and parasites. The diversity of environmental stresses that have been shown to cause an increase in asymmetry is probably not exclusive; many other kinds of stress might provide similar effects.
What are some sources of environmental variation?
These forms of variation are caused by factors found in the environment. The most important of these factors include lifestyle (diet and exercise), temperature and water level. For plants, light levels could also be included.
What are three causes of variation?
Major causes of variation include mutations, gene flow, and sexual reproduction. DNA mutation causes genetic variation by altering the genes of individuals in a population. Gene flow leads to genetic variation as new individuals with different gene combinations migrate into a population.
What is environmental variation?
the ability of an organism to alter greatly its PHENOTYPE depending upon environmental conditions. The phenomenon is seen most clearly in plants, perhaps because they are fixed in the ground.
How does environmental factors affect the expression of traits?
Environmental factors often influence traits independently of genes. But not always. Sometimes the environment changes a gene—either its DNA sequence or its activity level. Either of these effects can change the proteins that are made from a gene, which in turn affects traits.
How does the environment affect variation in plants?
If any environmental factor is less than ideal, it limits a plant’s growth and/or distribution. … In other cases, environmental stress weakens a plant and makes it more susceptible to disease or insect attack. Environmental factors that affect plant growth include light, temperature, water, humidity, and nutrition.
What is an environmental trigger give an example?
Some common triggers include dust mites and mold, pets, strong odors, cockroaches, cigarette and cigar smoke, viral or sinus infections, emotions, weather changes, pollution, and exercise. (See “Examples of Triggers” for a more extensive list.)
How environmental factors affect genes?
Environmentally induced changes in gene expression occur when exposure to chemicals changes which genes are turned “on” or “off”—which can change how the cells function and thus a person’s predisposition to disease. The effect of this chemical modification is called epigenetic regulation.