Snails'R'us


 * Snails’R’us **

__ Revisions underlined. __


 * Group **

Vijayarani Narayanan* Jocelyn Tandoh Carla Sena Egle Maksimovaite


 * Hypothesis **

__ Frequency of polymorphism of Snails (//Cepaea Nemoralis)// will be high in certain habitats such as the woodlands and scrub. There will be some selection. Gene flow and genetic drift will account for variation. __


 * Null Hypothesis **

__ Frequency of polymorphism of snails //(Cepaea Nemoralis)// will not be high in certain habitats which suggests gene flow. There will be no selection. Variation will not be down to gene flow and genetic drift. __

We decided to place 2 transects going from top to bottom to sample for altitude-climate differences along each of the transects. We will be placing the samples along the transects e.g. some close together and some far apart ‍. S__amples will be placed 20meters apart to account for gene flow and independence.‍‍ All other variables ‍‍apart from altitude/climate will be kept constant. ‍‍3 samples will be taken from each habitat e.g. scrub and woods. We are comparing 2 sites, the bushes and woodlands so there are a total of 3 samples in each of the sites so there is replication A total of 6 samples will be taken. for further replication we can combine data with another group so there will be 6 samples in each site.__
 * Design **

__ We are not taking samples at random as we want to collect consistently from each habitat on the basis of utility. __




 * Advantages of the design: **

__ We are measuring variation in altitude/climate so all other variables will be kept constant. We are only comparing 2 sites out of the three to optimise replication of data. __


 * Disadvantages of the design: **

__ We only have a limited number of 6 samples and also limited time. We are not taking samples from the open space habitat. We are not taking variables apart from climate/altitude in to account. __