Which environmental factor could lead to a decrease in genetic variation in population of tuna?

Overfishing a tuna species may decrease the genetic diversity of those species, affecting its population structure.

Which environmental factor could lead to a decrease in genetic variation of tuna?

Answer: The environmental factor that could lead to a decrease in genetic variation in a tuna population is an increase in pollution (second option).

What decreases genetic variation in a population?

The Bottleneck Effect

The genetic structure of the survivors becomes the genetic structure of the entire population, which may be very different from the pre-disaster population. Effect of a bottleneck on a population: A chance event or catastrophe can reduce the genetic variability within a population.

What environmental factors can lead to 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 …

What factors affect genetic variation?

Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).

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Which environmental factor would likely lead to an increase?

The environmental factor would likely lead to an increase in genetic variation in a population of squirrels is following – an increase in pollution. Pollution can be defined as introduction of various contaminants into a natural environment which can cause various adverse changes.

Which of the following could increase genetic variation?

Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).

What reduces variation in a population quizlet?

Gene flow tends to reduce genetic differences between populations. If it is extensive enough, gene flow can eventually mix neighboring populations into a single population with a common gene pool.

Do mutations decrease genetic variation?

Mutations can introduce new alleles into a population of organisms and increase the population’s genetic variation.

How can gene flow decrease genetic variation?

For this reason, gene flow has been thought to constrain speciation and prevent range expansion by combining the gene pools of the groups, thus preventing the development of differences in genetic variation that would have led to differentiation and adaption.

What are the environmental factors of variation?

Environmental causes of variation

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.

Do environmental change causes variations in populations?

Both environmental and genetic effects contribute to phenotypic variation within and among populations. … The effect of environmental variation on its production is a critical gap in our understanding of its genetics and evolution.

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