2019年11月22日 · In the context of Darwin's Variation under Domestication, "true breeding" is a phenotypic characteristic rather than a genetic one. True-breeding organisms produce offspring that are identical to themselves, concerning some trait -- i.e. white fantails, when bred with white fantails, produce characteristically white offspring.

2016年8月2日 · If they are "pure-breeding", that means that they are homozygous. If they were heterozygous, the offspring would not all have the same color as the parents. But tree-breeding" means they all do.

2016年12月31日 · Cross breeding : between different breeds. Outcrossing : unrelated individual,same breed,no common ancestor. Detailed answer. Inbreeding it is a mating within the same breed between different superior male and superior female. Inbreeding between close relatives can cause inbreeding depression like decreased Vigour , fertility and productivity.

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You are basically correct. Most common usage in my experience: Inbreeding refers to sexual reproduction between genetically closely related individuals, within a species.

2022年11月1日 · So a pea plant that hasn't been manipulated will be "true breeding" that is, homozygous for the allele in question. You can therefore tell after you've let them self-fertilize. Homozygous individuals have identical offspring for the trait when selfed, whereas selfing heterozygotes have a quarter of their offspring looking different for the trait.

2016年5月26日 · many might be produced. — This requires principle that the permanent varieties produced by inter confined breeding & changing circumstances are continued & produced according to the adaptation of such circumstances, & therefore that death of species is a consequence (contrary to what would appear from America) (page 39)

To calculate recombiation frequencies and thus create a genetic map from this, you have to have true breeding parents for two or more different genes. You have to cross these parents, so that you have an F1 generation consisting only of heterozygotes; You then have to backcross the F1 individuals with either of the parents.

I'll add an informal answer to complement @Remi.b's excellent answer. In a very simple sense, you can think of the effective population size as the number of reproducing (breeding) individuals in a population. Nature Education has a very good (and free) Scitable article on Genetic Drift and Effective Population Size. The article makes four ...

2021年12月18日 · Mating with siblings or incestuous relationships (breeding within blood relatives) enhances the chance of expression of disadvantageous characteristics (mostly recessive alleles). Therefore, natural selection for complex animals occurred in such a way they avoid close relation mating. Wolves are no different.