The graph shows the population size and amount of genetic variation in the Sarotherodon galilaeus fish population over a period of time. Overfishing of S. galilaeus in 2008 led to a drastic decline in their population size. Although the population has since increased, the genetic variation in S. galilaeus is still low. At which point on the graph was the population most vulnerable to the bottleneck effect due to a natural disaster and why? A. Y, because the population is small and there is low genetic diversity B. Z, because the population is large but the genetic diversity has remained low C. X, because the population is too large and has exceeded its carrying capacity D. W, because the population is just starting out and natural selection is still taking place
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.
The graph shows the
Overfishing of S. galilaeus in 2008 led to a drastic decline in their population size. Although the population has since increased, the genetic variation in S. galilaeus is still low. At which point on the graph was the population most vulnerable to the bottleneck effect due to a natural disaster and why?
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