Biology

PART III: Calculating the frequency of corn kernel characteristics In this part of the lab, frequencies of two corn kernel characteristics will be determined: kernel color and kernel texture. In observing the ears of corn, note that the kernels are either purple or yellow and that they are either smooth or wrinkled. With respect to […]

PART II: Identifying and counting cells For this section of the lab, you will view a micrograph of an onion root tip that shows cells in the different stages of mitosis. Before beginning the steps below, view the following micrograph of an onion root tip to become familiar with the different stages of mitosis, as

PART I: Building models of the cell cycle stages 1. Review the stages of the cell cycle to review the major events that occur during each stage. Also, the student should reference the image below which shows some of the visual differences between the stages of mitosis. Click on image to enlarge. Click on image

Lab 6 Cell Division, Mitosis, and Meiosis Introduction: Connecting Your Learning All cells, including those in the human body, have a cell cycle. This cycle involves preparing for cell division and eventually dividing. Coupled with cell division is nuclear division. Nuclear division, either mitosis or meiosis, is the process by which the nucleus of a

NO PLAGIARISM NO PLAGIARISM BIOLOGY ONLY There is no minimun count of words just anwer the question. There are 10 questions based on little videos. ALL ANSWERs must come from the video NO PLAJIARISM IT WILL BE CHECKED. just be honest and do it the right This assignment is really important . THis due TOMARROW

Non-random mating   How can you mate non-randomly if you are alone? Anyway, click reset. Unlike the other four assumptions of HW, non-random mating does not change allele frequencies, instead it changes genotype frequencies from p2 + 2pq + q2 = 1. Change the simulation display vertical axis so that it displays “Frequency of genotype

Genetic Drift OK, this one not so quick and easy. Click reset and get ready for some fun.   Drift depends upon random events; in large populations random events tend to cancel each other out, so there is minimal net effect, but in small populations random events can cause dramatic effects on outcomes. Because the

Gene flow Also quick and easy. Click reset. Note the default settings: A1 allele starts in your population at frequency 0.5, with no immigration from some other source population which also has A1 allele frequency of 0.5. Click run and nothing changes; you did that before – it is just HW.   Now change the

So what do you conclude about the evolutionary power of mutation (all by itself) to change allele frequencies? This one is quick and easy. Click reset. Then make the mutation rate of A1 to A2 something that is high but biologically plausible, e.g. 0.0001, and the reverse mutation rate A2 to A1 just leave at

Familiarize yourself with the basic controls.   Basically the software graphs allele frequency versus time for the “A1” allele (i.e. “p”) at a two allele locus. By clicking the arrow pointing down on the left side of the graph just below “Frequency of allele A1” you can opt to graph the frequency of the A2