16 pipe cleaners* (4 each of 4 different colors).Pay attention to what you are modeling in each step. You will then rearrange the pipe cleaners to explore the processes of meiosis and cell division that produce sperm and egg cells.īe sure to: Follow safe practices during this investigation. You will use pipe cleaners to represent the four homologous pairs of chromosomes in the nucleus of the cell, as you did when you modeled mitosis. In this descriptive lab, you will model meiosis that begins in a cell of the fruit fly ( Drosophila melanogaster). This diagram compares the processes of mitosis and meiosis. Cells in reproductive organs undergo meiosis as they divide to form germ cells that mature into gametes - egg cells or sperm cells. So, how can these haploid cells be made? The answer is meiosis. The egg cell and sperm cell that fused to produce you were haploid, which means having one set of all an organism's chromosomes. Why are your chromosomes in pairs? Because you received one complete set of chromosomes from your mother and one complete set from your father. Mitosis maintains the 2n number of chromosomes in body cells. In total, your cells have 46 chromosomes, or 23 homologous pairs of chromosomes. In order to produce all your genetic traits, your cells need two, or a pair, of each of the 23 types of human chromosomes.
#Prophase model series#
Each type of chromosome contains a unique series of genes that codes for only some of your traits. This means that it has a nucleus that contains two sets of the 23 types of chromosomes found in humans. Each of your body cells is a diploid cell, which is represented by the expression 2n.
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