Imagine that you are planting a garden, and you have collected and then planted
ID: 286080 • Letter: I
Question
Imagine that you are planting a garden, and you have collected and then planted some plants. The plants are all of the same species, and they constitute a new population. You count how many you have planted in each of three height categories, and you produce the graph titled "Height Distribution." You also keep track of how many seeds each plant in your population produces. You plot a graph of seed number versus plant height, and you title that graph Reproductive Output." Height Distribution Reproductive Output 110 90 70 50 30 10 40 30 20 10 0-5 5-10 10-15 10 15 Plant height (cm) Plant height (cm)Explanation / Answer
ANSWER :
The correct graph is: Graph B
EXPLANATION :
Evolution by natural selection needa a population to be genetic variability which leads to variation in heritable trait.
In this question, the heritable trait given is plant height, and it is shown wide range of plant heights that explained that there is indeed genetic variation.
Natural selection also needs environmental conditions so that individuals with some values of the trait have greater survival or reproductive rate than individuals with other values of that trait.
The graph shows that plants with shortest height have more reproductive success than plants with other two classes. So plants with shortest height has more offspring than the other plants.
As plant height is heritable, so more plants in the next generation will be in this class. In succeeding generations , there must be more and more short plants present in the population.