I have to draw a labelled diagram to show the chromatids of a diploid cell at the end of anaphase I of meiosis for a person who is heterozygous for both characters. (both characters being Huntingdon disease(H) on the short arm and red hair gene(R) on the long arm.)
I know that the bivalents separate and one chromosome of each homologous pair is drawn to each pole but can anyone tell me if I need to draw one or two pairs of chromosomes and where I would place the letters R and H, do I also need r and h? Any help would be much appreciated!
To draw a labelled diagram of the chromatids at the end of Anaphase I of meiosis for a person who is heterozygous for both characters (Huntington's disease and red hair gene), you will need to consider the following:
1. Meiosis I separates homologous chromosomes, so you will have two pairs of chromosomes.
2. Each pair of homologous chromosomes will consist of one chromosome with the Huntington's disease gene (H) and one without (h), and one chromosome with the red hair gene (R) and one without (r).
Here's a step-by-step guide to help you draw the labelled diagram:
1. Start by drawing two pairs of chromosomes in the center of your diagram. Each pair should consist of two sister chromatids joined at the centromere.
2. Label one chromosome in each pair with the letter H (representing the Huntington's disease gene) and the other chromosome in each pair with the letter h (representing the absence of Huntington's disease gene).
3. On one of the chromosomes in each pair, draw a small dot or a colored section to represent the red hair gene (R), and leave the other chromosome in each pair blank to represent the absence of the red hair gene (r).
4. Now, imagine the process of Anaphase I where homologous chromosomes separate and move to opposite poles of the cell.
5. Draw an arrow from each pair of chromosomes to show their separation. Each arrow should connect to one of the poles and indicate the direction of movement.
6. At each pole, you will now have one chromosome from each homologous pair, with its sister chromatids still joined.
Once you have completed these steps, your diagram should clearly show the chromatids at the end of Anaphase I, with one pair of chromosomes at each pole and the appropriate labels for Huntington's disease (H or h) and the red hair gene (R or r).