Asked Jan 13, 2019

Meiosis Drawing
In this assignment you will track and draw the chromosomes of a diploid organism through all the stages of meiosis. Make sure you label the alleles for genes on the chromosomes the whole way through - every chromatid should have labeled alleles. For meiosis, both crossing over and independent assortment can occur. For the purpose of this exercise, assume that there is a single crossover event on the long chromosome between the A and D genes. Only show crossing over after its fully occured. There are no crossover events on the short chromosome. Regarding independent assortment, there are two possible outcomes in meiosis if there are two homologous pairs of chromsomes. Include both independent assortment possibilities - one on the left side and one on the right. Fill in the possible gamete genotypes for each outcome. If you do this correctly you should end up with 8 different types of gametes. Image attached for genotypes and alleles. Give me a full explaination of each of the two possibilities of meiosis and crossover events dueing them too.

Cell Membrane
Prophase I

Image Transcriptionclose

Nuclea Cell Membrane Genotype Prophase I Metaphase


Expert Answer

Step 1

Meiosis is a sequence of two cell divisons that form haploid gametes from the germ cells which are diploid. The diploid cell undergoes replication of the deoxyribonucleic acid (DNA). The diploid cell is 2N, where N is the no. of chromosomes. The replication of the DNA of the diploid cell makes the DNA content four times. In meiosis, two cell divisons takes place succesively, with  no additional replication of DNA, resulting in four haploid cells. 

Step 2

Two cycles of nuclear divison occur during the course of meiosis, that is, Meiosis-I and Meiosis-II. Meiosis I is divided into prophase I, metaphase I, anaphase I, and telophase-I. Meiosis II is divided into prophase II, metaphase II, anaphase II, and telophase II. Meiosis II is similar to mitosis, while crossing over of the homologous chromosomes takes place in meiosis I. 

Step 3

Meiosis I

1. Prophase I- At this phase two homologous chromosomes assemble together in a pair. The pair of sister chromatids resemble an X as they line up next to each other.  Each set undergoes crossing over and exchanges small portions of DNA. This ...


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