Question

On the diagram you will upload for this assignment, Draw a line down the middle of the page. On the LEFT side of the line, draw and label the following stages of Meiosis (in order): Metaphase I (one circle at the top of the page), Metaphase II (two circles, in the middle of the page) and gamete (four circles, at the bottom of the page). Start with a cell that is 2n=4 with two large and two small chromosomes. Make one “set” (one large and one small chromosome) the same color, and the other set a different color. Label one of the large chromosomes with allele “A” and the other allele “a”, like we did in class. Label one of the small chromosomes with allele “B” and the other allele “b”.) For replicated chromosome draw an X and for single chromatids draw a line ( / ). Since we are focusing on the DNA, you can skip drawing the nuclear membrane or spindle fibers. For simplicity, do not indicate crossover in your diagrams.

Now on the right side of the line on your page, please draw the second independent way homologs could line up Metaphase I (one circle). This illustrates the Principle of Independent Assortment, see figure 16.15 on page 338. Draw the Metaphase II (two circles) and gamete (four circles) beneath this. Notice that there are 8 circles but only 4 types of gametes on your page. Label gametes as AB, ab, Ab or aB. This concept may feel premature in context of Chapter 11 topics but it sets us up for Chapter 16. Independent Assortment is a very important source of genetic variation.

Answer 1

In independent assortment, there is found independent arrangements of chromosome occur at the equatorial plate during metaphase. There is found two way of Independent assortment and two case of metaphase are found. There is also produced bariation in gametes also. If you compare the gametes of this two case. There is found two genetic variation.

Please look in the image for solution: