Chapter 10, Problem 13STP

Summary Introduction

To explain:

The manner in which meiosis promote genetic variation in a species.

Introduction:

Reproductive cells which pass on genetic traits from the parent to child are produced by the process of meiosis. In order to maintain the same number of chromosomes in each generation, an organism produces gametes. When a male gamete fuses with a female gamete, the process is called fertilization. Fertilization allows genetic variations in organisms.

Answer to Problem 13STP

Crossing over during meiosis results in exchange of genes between homologous chromosomes. This leads to recombination of genetic material between two homologous chromosomes. This promotes genetic variation in a species.

Explanation of Solution

Crossing over is the process by which the genetic material between non sister chromatids of homologous chromosomes is exchanged. It results in new combinations of genes in the daughter cells. During prophase I of meiosis, the homologous chromosomes align with each other and exchange some part of their chromosome so that the resultant chromosomes are recombinants- that is they have a mix of genes derived from both parental chromosomes. This results in genetic variation in a species.