Cross Breeding
Cross Breeding - Related Videos
01:59
Plant Breeding and Biotechnology
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2020
Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food. As humans' understanding of genetics advanced, improved crop varieties could be achieved more quickly. Artificial selection could be more directed, and crop varieties enhanced for favorable traits more quickly to produce better, more robust, or more palatable plants.
15:00
Fundamentals of Breeding and Weaning
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN Millions of mice and rats are bred for use in biomedical research each year. Worldwide, there are several large commercial breeding facilities that supply mice to research laboratories, but many facilities also choose to breed mice and rats in-house to reduce costs and increase research options. When breeding in the animal facility, researchers are able to manipulate the genetics of the...
07:48
Zebrafish Breeding and Embryo Handling
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2023
Zebrafish (Danio rerio) are an important model organism that is particularly valuable for research in developmental biology. Zebrafish are extremely fertile and can produce hundreds of progeny per week, so it is relatively easy to collect a large number of embryos for high sample numbers. Furthermore, zebrafish undergo rapid development and embryos are transparent, allowing for easy visualization of developmental processes. This video covers the steps required for the collection of newly...
01:33
Breeding Management in Rodent Studies
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Breeding management supports the 3Rs by minimizing unnecessary animal production and ensuring that only the number of animals required for a study is generated. Effective breeding strategies help reduce surplus animals and...
08:45
Genetic Crosses
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2023
To dissect genetic processes or create organisms with novel suites of traits, scientists can perform genetic crosses, or the purposeful mating of two organisms. The recombination of parental genetic material in the offspring allows researchers to deduce the functions, interactions, and locations of genes. This video will examine how genetic crosses were influential in developing Mendel's three laws of inheritance, which form the basis of our understanding of genetics. One genetic crossing...
FAQs
Cross breeding creates novel allele combinations through two linked genetic processes: segregation separates parental alleles during meiosis, while recombination reshuffles genetic material before fertilization produces offspring. As a result, siblings can inherit different combinations of traits even when they share the same parents. This genetic variation gives researchers material for studying inheritance and identifying useful trait combinations.
Hybrid vigor, or heterosis, describes the sometimes improved performance of cross-bred offspring. The effect is not guaranteed and should be measured in the progeny rather than assumed. Because performance may decline or change in later generations, researchers evaluate successive generations when assessing whether a cross provides a stable advantage or only a temporary improvement.
Parent choice strongly influences the range and usefulness of offspring traits. Crossing genetically distinct breeds, varieties, strains, or populations can combine desirable characteristics, but it can also bring together alleles associated with unwanted traits. Consequently, a successful cross is judged by observed progeny performance, not by parental characteristics alone. Evaluation distinguishes favorable combinations from unfavorable ones.
A basic cross-breeding workflow begins with selecting genetically distinct parents for traits of interest, mating them, and examining the resulting progeny. Researchers then compare offspring characteristics with the intended goals, such as growth, productivity, disease resistance, or environmental tolerance. Careful progeny evaluation is essential because the mating itself does not ensure that every offspring will show the desired combination.
It is useful when researchers need to investigate how traits are inherited or increase genetic variation within a study population. By examining offspring from different breeds, varieties, strains, or populations, they can observe which trait combinations appear and how consistently they are inherited. The approach therefore links genetic mechanisms with practical efforts to develop organisms with selected characteristics.
In applied biology, researchers may assess crosses for improved growth, productivity, disease resistance, or tolerance of environmental conditions. These outcomes are examined in the progeny to determine whether a particular parental combination meets its purpose. The same framework supports both organism improvement and biological analysis, while recognition of unwanted traits helps prevent selection based on incomplete performance observations.