Chapter 10.3, Problem 6MI

Summary Introduction

To summarize:

Five pieces of information about genetic recombination by creating a concept map

Introduction:

The main advantage of sexual reproduction is that it produces genetic variation in species. Genetic variation arises due to differences in genetic sequence in DNA among individuals. Genetic variation helps species survive better in adverse conditions. Meiosis contributes to the amount of genetic recombination in a particular species.

Answer to Problem 6MI

  

Explanation of Solution

1. The assortment of chromosomes and the genetic information they carry either by crossing over or by independent segregation of homologous chromosomes is called genetic recombination.
2. Crossing over- During crossing over chromosomal segments exchange between a pair of homologous chromosomes. This results in exchange of genes between homologous chromosomes. Crossing over produces new combination of genes. This new combination of genes leads to genetic recombination.
3. Random mating- Random mating allows organisms to combine their gametes and chromosomes randomly. Organisms select their mates randomly and this leads to random fertilization of gametes. This creates genetic recombination.
4. Independent assortment- Independent assortment of genes also contributes to genetic recombination. Genes that are linked together on the same chromosomes usually travel together in a gamete. The crossing over of linked genes is a source of genetic variation.
5. Genetic variation is possible due to genetic recombination. Variation is important for evolution of species.