Approximately what percentage of genetic variation remains in a population of 25 individuals aft

step 1 So we want to think about genetic drift, which is the random change and allele frequencies attri

Approximately what percentage of genetic variation remains...

Key Concepts

Exponential Decay Model in Genetics

The exponential decay model in genetics describes how heterozygosity decreases over successive generations due to genetic drift. Specifically, the proportion of heterozygosity remaining after each generation can be modeled by the factor (1 - 1/(2N)), where N is the effective population size. Over multiple generations, this decay accumulates, providing a quantitative tool for estimating the reduction in genetic variation in small populations.

Effective Population Size

Effective population size is an idealized number that reflects the number of breeding individuals in a population contributing to the next generation’s gene pool. It can be smaller than the actual population census size and is crucial for predicting the impact of genetic drift. Smaller effective population sizes accelerate the loss of genetic variation over time.

Genetic Drift

Genetic drift refers to the random fluctuations in allele frequencies from one generation to the next due to chance events. In small populations, these random changes can lead to a significant loss of genetic variation over time, making genetic drift a critical concept in understanding how diversity is maintained or diminished across generations.

Heterozygosity

Heterozygosity is a measure of genetic variation within a population, representing the probability that two alleles randomly selected from the gene pool are different. It is often used to quantify the level of genetic diversity and is sensitive to the effects of genetic drift in small populations, where loss of heterozygosity indicates a reduction in genetic variability.

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