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Chapter 7: Problem 14

Breeding between animals of same breed is called

Short Answer

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Short Answer: Same-breed breeding, also known as inbreeding, is the process of mating animals of the same breed to produce offspring with specific traits or characteristics. It is common in domesticated animals and offers advantages such as maintaining breed purity and predictability of traits. However, disadvantages include a limited gene pool leading to reduced genetic diversity, increased health issues, and reduced fertility in the offspring. An alternative to same-breed breeding is crossbreeding, which introduces new genetic traits and increases genetic diversity.

Step by step solution

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1. Understanding the concept of breeding

First, let's understand what breeding means. Breeding is the process of producing offspring by mating animals, usually to produce specific traits or characteristics in the offspring. When two animals of the same breed are mated, it is called "same-breed breeding" or "inbreeding."
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2. Examples of same-breed breeding

Same-breed breeding is common, especially in domesticated animals like dogs, cats, and livestock. For example, a Labrador Retriever bred with another Labrador Retriever will produce purebred Labrador offspring. Similarly, breeding two Holstein cows will result in purebred Holstein calves.
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3. Advantages of same-breed breeding

There are several advantages to same-breed breeding, primarily in maintaining breed purity and predictability of the offspring's traits. Breeders can select animals with desirable traits such as good temperament, strong genetics for specific purposes (e.g., herding, racing, or producing milk), and a consistent appearance that adheres to breed standards.
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4. Disadvantages of same-breed breeding

However, there are several disadvantages to same-breed breeding. One significant disadvantage is the potential for inbreeding depression, where a limited gene pool can lead to reduced genetic diversity, which in turn may cause increased health issues and reduced fertility in the offspring. Homozygosity of deleterious traits (harmful traits that are inherited by offspring) may also increase with inbreeding, causing health and genetic disorders in the offspring.
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5. Alternatives to same-breed breeding

An alternative to same-breed breeding is crossbreeding, where animals of different breeds are mated. Crossbreeding can introduce new genetic traits and increase genetic diversity within the population, potentially improving overall health, fertility, and strength. Crossbreeding can also result in offspring with unique or desirable traits that may not be present in either parent breed.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Inbreeding
Inbreeding is when animals of the same breed are bred together. This often occurs in animals such as dogs, cats, and livestock. By mating within the same breed, breeders aim to produce offspring that maintain specific characteristics, like structure, size, or temperament. The goal is often to preserve the purity of a breed.

However, inbreeding can sometimes result in negative consequences.
  • Reduced genetic diversity, which can make animals more prone to diseases.
  • Inbreeding depression, which refers to the decrease in vitality and health.
Therefore, while it can help maintain breed traits, it needs careful management to avoid negative outcomes.
Crossbreeding
Crossbreeding involves mating animals from different breeds. Unlike inbreeding, crossbreeding mixes genetic material from two distinct breeds. This often leads to offspring with a blend of desired traits from both breeds.

Advantages of crossbreeding include:
  • Increased genetic diversity, which can lead to healthier animals.
  • Opportunity for unique combinations of traits, providing wider possibilities.
However, results can be unpredictable. Traits from each parent may combine in unexpected ways. Crossbreeding requires careful planning and evaluation of each breed's strengths.
Genetic Diversity
Genetic diversity refers to the total number of genetic characteristics in the genetic makeup of a species. It plays a crucial role in the health and adaptability of animals. A diverse gene pool allows populations to adapt to changes and resist diseases more effectively.

When breeding, maintaining genetic diversity is essential to ensure long-term species survival. Lower genetic diversity, often a result of excessive inbreeding, can lead to:
  • Increased vulnerability to environmental changes.
  • Higher chances of genetic disorders.
Crossbreeding and careful selection of breeding pairs help enhance genetic diversity.
Purebred Animals
Purebred animals are bred from parents of the same breed, meaning they have a consistent set of characteristics that define the breed. This is often seen in specific dog breeds like Labrador Retrievers or cats like Siamese.

Benefits of purebreds include:
  • Predictable traits, such as appearance and behavior.
  • Adherence to breed standards, which are desirable in competitive events or specific purposes like herding.
Yet, breeding purebreds often involves inbreeding, which can increase the risk of health issues. A balance needs to be found to maintain breed standards while promoting genetic diversity to ensure the well-being of purebred animals.

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