Question

please help with the graph! I am having a hard time doing it !

NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE Part IV-An Experiment A team of scientists at the Imperial College London tackled the pro tre magazine (March 25, 2005). They decided to use veasts, which are can reproduce both sexually and asexually, are easy to keep in the lab casts normally reproduce asexually, but when they are stressed (starved, high temp reproduce sexually. The scientists did not want this switching to occur. So they gene asexual strain. They deleted the two genes (sport and Spor3) required for normal me reproduction was impossible. Now they had two pure strains asexual and The Imperial College team decided to comnare the reproductive rate of the asexual vs. the sexual yeasts in two different environments: harsh and benien That is, fitness" would be measured by comparing the growth rate relative to the non-evolved ancestral strain. The benign environment had plenty of nutrients although glucose was limited so that growth was not uncontrolled. The harsh environment had the same glucose concentration but was at a higher temperature and had more demanding osmotic conditions Perial College London tackled the problem and published their results in ecided to use yeasts, which are single-celled fungi, because they sexually, are easy to keep in the lab, and reproduce very rapidly they are stressed (starved, high temperatures, etc.) they will switching to occur. So they genetically manipulated one SPOT) required for normal meiosis, so that sexual Muestion 1. On the graph below plot the results you would expect if Weismann's hypothesis were correct. Plot the changes in fitness values over time in the populations of sexual yeasts in benign conditions, asexual yeasts in benign conditions, asexual yeasts in harsh conditions, and sexual yeasts in harsh conditions. Natural logarithm of relative fitness 0 50 100 150 200 Mitotic generation 250 300

Answer 1

ANSWER :-

Natural Logarithm of relative fitness 50 100 250 300 150 200 Mitotic Generation sexual reproduction in harsh environment Asexual reproduction in harsh environment Sexual reproduction in benign environment Asexual reproduction in benign environment

1. First of all, it should be stated that the individuals that are able to undergo sexual reproduction or the ones who are the wild-type strains are the fittest individuals to survive under harsh conditions as can be seen through the graph as compared to the asexually reproducing modified strains.
2. In case of the benign conditions, there was no external stress associated with the individuals which led to a normal growth rate and a limited fitness value.