Which population would be more likely to be affected by genetic drift?

Which population would be more likely to be affected by genetic drift?

Genetic drift is more common in smaller populations. Imagine an island where 5 white rabbits and 10 grey rabbits live. Perhaps grey rabbits have better camouflage against the island’s rocks. If a storm randomly kills 10 grey rabbits and 2 white rabbits, only the white rabbits survived to pass on their genes.

What decreases genetic variation?

Sources of Decreased Variation Mutation, recombination, and gene flow all act to increase the amount of variation in the genotypes of a given population. There are also forces at work that act to decrease this variability.

Which population is more affected by genetic drift big or small?

Small populations tend to lose genetic diversity more quickly than large populations due to stochastic sampling error (i.e., genetic drift). This is because some versions of a gene can be lost due to random chance, and this is more likely to occur when populations are small.

What type of selection eliminates intermediate phenotypes?

Diversifying selection

What are the three types of natural selection?

The 3 Types of Natural Selection

• Stabilizing Selection.
• Directional Selection.
• Disruptive Selection.

What kind of natural selection maintains the most genetic variation?

Neutral model: According to the neutral model, most genetic variation in organisms, as seen in proteins and DNA molecules, has no effect on fitness, and therefore is maintained for no particular purpose. The majority of mutations that occur are deleterious, and are quickly removed by selection (Figure 20).

What are 2 sources of genetic variation?

Natural selection acts upon two major sources of genetic variation: mutations and recombination of genes through sexual reproduction.

Why does variation persist in the face of natural selection?

Genetic variation in a population is derived from a wide assortment of genes and alleles. The persistence of populations over time through changing environments depends on their capacity to adapt to shifting external conditions.

What accounts for variation in a population?

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 is genetic variation within a population?

Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing environmental circumstances.

Where does genetic variation come from?

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

What are examples of genetic variation?

Examples of genetic variation include eye color, blood type, camouflage in animals, and leaf modification in plants.

What is the original source of variation?

Mutation is the original source of genetic variation. Even in a population in which all copies of a chromosome were identical, new genetic variants would arise by mutation.

What is the original source of genetic variation in a population?

Mutations are the original source of genetic variation. A mutation is a permanent alteration to a DNA sequence.

How do you determine genetic variation?

Genetic variation can also be identified by examining variation at the level of enzymes using the process of protein electrophoresis. Polymorphic genes have more than one allele at each locus.

What is the ultimate source of genetic variation?

The ultimate source of all variation is mutation. However, within a population, the quantitative frequency of specific genotypes can be changed by recombination, immigration of genes, continued mutational events, and chance.

Which group has the most genetic variation?

On average, any local population contains 85% of all human genetic variation, and any continent contains 94%….

• Italians and Ethiopians.
• Senegalese and Kenyans.
• Italians and Swedes.
• Chinese and Lakota (Sioux)
• Saudi Arabians and Ethiopians.

What is the primary ultimate source of genetic variation in a population?

Mutation is the ultimate source of genetic variation, but mechanisms such as sexual reproduction and genetic drift contribute to it as well.