Draw a chromosome and a pair of homologs (or homolog pairs, or homologous chromosomes). Label on the chromosome and homologous pair; the centromere and sister chromatids. In each of these drawings explain how many and where are the Watson and Crick double strand DNA molecules. 2.Diagram of the cell cycle (not cell division) for an organism with two chromosomes (n=2, 2n=4). Include; interphase (including the G1, S, G2 phases), mitosis and cell cycle checkpoints. 3.For an organism with 4 chromosomes draw: a. Metaphase of Mitosis, b. Metaphase of meiosis I, Metaphase of meiosis II.

There are two different pathways for repairing double-strand breaks in the DNA. In which type of cell is homology-directed repair least likely to be able to repair the damage? Choose one. A haploid cell A diploid cell in G1 phase of the cell cycle A diploid cell in G2 phase of the cell cycle All three the same.

1. In the simple picture below we are focusing on the chromosomes. Notice that the chromosomes are condensed and the nuclear membrane and spindles are not shown. a. Please label the following and indicate with arrow(s): sister chromatids, a pair of homologous chromosomes, a centromere. b. Label the part of diagram that indicates a double helical molecule of DNA and highlight it with a thick line. c. How many molecules of DNA are shown in this picture? d. Is this cell haploid or diploid (circle one). How do you know? e. Below the diagram, indicate the ploidy (number of sets of information) and the number of chromosomes X n= ploidy (# of sets of information) X X M # of 2. The circle below represents the cell cycle. chromosomes a. Write the phases (G1, G2, M and S) in the appropriate sections. b. Which phase results in identical sister chromatids? c. In which phase do sister chromatids separate?

In the lab we use beaded plastic models to represent an unduplicated chromosome: (first picture)   Imagine that you put together 8 chromosomes as shown below: (2nd picture)   and then you join the sister chromatids together at their (magnetic) centromeres. How many chromosomes are represented by four sister chromatids joined together at their (magnetic) centromeres ?         2     4

|(big/ prokaryote / eukaryote), which lack membrane bound prganelles and a nucleus and (small/ prokaryote / eukaryote), which contain membrane bound organelles. The nucleus of eukaryotic cells separated from the cytoplasm by a (cellular / nuclear / sticky) envelope. The hereditary material is in the nucleus. It exists as (DNA only / histones only/ chromatin) until the cell divides and then we see chromosomes.

Please design a map based on the word bank

2.) One experimental tool used in the biological research and in clinical settings is called Fluorescent Activated Cell Sorting (FACS) or cell cytometry. For example, a cell membrane permeable (or nonpolar) chemical called Hoescht 33342 dye will specifically label DNA. Interpret the graph (Figure 17-4) that illustrates normal cells that have been labeled with Hoescht 33342 dye, and assign which phase(s) of the cell cycle (G1, S, G2, or M) corresponds to the fluorescence intensity. Justify your answers. 1 relative fluorescence per cell Figure 17-4 Analysis of Hoechst 33342 fluorescence in a population of cells sorted in a flow cytometer (Problem 17-15). number of cells

My drawing refers to this question.