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Chapter 3: Problem 19

Explain why the products of meiosis may not be genetically identical, whereas the products of mitosis are.

Short Answer

Expert verified
The genetic differences between the products of mitosis and meiosis arise from the different methods and purposes of these two cell division processes. Mitosis aims to produce identical daughter cells for growth or repair, copying and splitting the parent cell's DNA without variations. However, meiosis, which results in the production of gametes for sexual reproduction, introduces genetic diversity through crossing over and independent assortment. These processes create new combinations of genes, resulting in four unique daughter cells.

Step by step solution

01

Understand the general process of Mitosis and Meiosis

Mitosis and meiosis are two types of cell division. While mitosis results in two genetically identical daughter cells from a single parent cell, meiosis, on the other hand, results in four genetically diverse daughter cells from a single parent cell.
02

Detailing the Mitosis process

In mitosis, a parent cell divides into two identical daughter cells. This happens through a series of processes (prophase, metaphase, anaphase, telophase, and cytokinesis) in which identical copies of each chromosome align at the equator and then separate into two identical sets. Therefore, the two newly formed daughter cells have the same genetic information as the parent cell.
03

Detailing the Meiosis process

Meiosis is a process where a single cell divides twice to produce four cells containing half the original amount of genetic information. These cells are our sex cells 鈥� sperm in males, eggs in females. During the first division, meiosis I, homologous chromosomes pair up and exchange segments of DNA in a process called crossing over. This mixing of genes produces cells with new combinations of genetic information. During the second division, meiosis II, these cells divide again without duplicating their DNA, resulting in four haploid daughter cells.
04

Comparing Mitosis and Meiosis

Both processes have different genetic outcomes. Mitosis produces genetically identical cells because it simply copies and splits the parent cell's DNA. However, meiosis produces genetically diverse cells because of two main events happen during meiosis I: crossing over (prophase I) and independent assortment (metaphase I), which both initiate diversity in the genetic material that will be inherited by the daughter cells.

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Most popular questions from this chapter

The arctic fox has 50 chromosomes (25 per set), and the common red fox has 38 chromosomes ( 19 per set). These species can interbreed to produce viable but infertile offspring. How many chromosomes would the offspring have? What problems do you think may occur during meiosis that would explain the offspring's infertility?

Assuming that such a fly would be viable, what would be the sex of a fruit fly with the following chromosomal composition? A. One \(X\) chromosome and two sets of autosomes B. Two X chromosomes, one \(Y\) chromosome, and two sets of autosomes C. Two \(\mathrm{X}\) chromosomes and four sets of autosomes D. Four \(\mathrm{X}\) chromosomes, two \(\mathrm{Y}\) chromosomes, and four sets of autosomes

Describe the cellular differences between male and female gametes.

With regard to sister chromatids, which phase of mitosis is the organization phase, and which is the separation phase?

Corn has 10 chromosomes per set, and the sporophyte of the species is diploid. If you performed a karyotype, what is the total number of chromosomes you would expect to see in each of the following types of cells? A. A leaf cell B. The sperm nucleus of a pollen grain C. An endosperm cell after fertilization D. A root cell
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