The following graph shows the probability of extinction for a population of Fund
ID: 275284 • Letter: T
Question
The following graph shows the probability of extinction for a population of Fundy Bay Atlantic Salmon when the captive bred population has a 30% lower fitness than the wild population. Pictured are the probabilities of extinction when heritability for fecundity is 0, 0.10 and 0.3. CIRCLE which line you suspect corresponds to a heritability of 0.3. (2 points). What does this suggest about adding captive bred individuals to this population over time when heritability is high (1 point)?
30% decline 1.0 0.8 0.6 0.4 0.2 0.0 0 10 20 30 40 50 YearsExplanation / Answer
Fitness is the measure of how well an organism is adapted to its environment. This further means that if an organism is fit, it has a higher chance of survival in comparison to the unfit organism. The extent of fitness also depends upon the fertility (the capability to produce offsprings) and fecundity (the number of gametes produced) of the organism. Only organisms with high fertility and fecundity can produce fit offsprings. So, it can be seen that fecundity lies in direct relation to fitness.
The given graph shows the probability of extinction for a population of Fundy Bay Atlantic Salmon. The legend of the graph is not explained clearly, so there are two possibilities for this graph -
?When heritibility of fecundity is high for the unfit/captive Salmon, adding captive bred individuals to this population over time will decrease the fitness of the population. This is because, the wild type will miss opportunities (taken by the captive Salmon) to mate and the number of fit offsprings will over time decrease. Since a high number of unfit offsprings will be produced, they will have a higher chance of mating, leading to a decrease in fitness of the whole population.
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