Chapter 13, Problem 14STP

Summary Introduction

To explain:

The reason for the pure bred animals to take many generations for development.

Introduction:

The process by which desired traits of certain plants and animals are selected and passed on to their future generations is called selective breeding. This can be achieved through hybridization and inbreeding. It increases the frequency of desired allele within a population.

Answer to Problem 14STP

Two closely related animals that have the desired traits are bred for several generations to eliminate the undesired traits in future generations. This is called inbreeding. Inbreeding helps in maintaining pure breeds.

Explanation of Solution

Once breeders observe a desired trait in an animal, they decide to breed two closely related animals that have the desired traits. They have to be bred for several generations to eliminate the undesired traits in future generations. This process is called inbreeding.

Pure breeds can be maintained by inbreeding as it results in offspring that are homozygous for most traits. Augus cattle and German shepherd dogs are examples of organisms produced by inbreeding. Special care is taken so that the animals don’t breed outside their group.

Hence pure bred animals take many generations to develop.