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- Test_cross abstract "In genetics, a test cross, first introduced by Gregor Mendel, involves the breeding of a individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analyzing proportions of offspring phenotypes. Zygosity can either be heterozygous or homozygous. Those that are heterozygous have one dominant and one recessive allele. Individuals that are homozygous dominant have two dominant alleles, and those that are homozygous recessive have two recessive alleles. The genotype that an offspring has for each of its genes is determined by the alleles inherited from its parents. The combination of alleles is a result of the maternal and paternal chromosomes contributed from each gamete at fertilization of that offspring. During meiosis in gametes, homologous chromosomes experience genetic recombination and segregate randomly into haploid daughter cells, each with a unique combination of maternally and paternally coded genes. Dominant alleles will override the expression of recessive alleles.Test crosses are used to test an individual's genotype by crossing it with an individual of a known genotype. Individuals that show the recessive phenotype are known to have a homozygous recessive genotype. Individuals that show the dominant phenotype, however, may either be homozygous dominant or heterozygous. The phenotypically dominant organism is the individual in question in a test cross. The purpose of a test cross is to determine if this individual is homozygous dominant or heterozygous.Test crosses involve breeding the individual in question with another individual that expresses a recessive version of the same trait. Analyzing the proportions of dominant and recessive offspring determines if the individual in question is homozygous dominant or heterozygous. If all offspring from the test cross display the dominant phenotype, the individual in question is homozygous dominant; if half the offspring display dominant phenotypes and half display recessive phenotypes, then the individual is heterozygous. Since the homozygous recessive individual can only pass on recessive alleles, the alleles the individual in question passes on determine the phenotypes of the offspring.".
- Test_cross thumbnail Punnett_Square_Test_Cross.PNG?width=300.
- Test_cross wikiPageID "3373433".
- Test_cross wikiPageLength "3756".
- Test_cross wikiPageOutDegree "16".
- Test_cross wikiPageRevisionID "703931976".
- Test_cross wikiPageWikiLink Allele.
- Test_cross wikiPageWikiLink Category:Classical_genetics.
- Test_cross wikiPageWikiLink Dominance_(genetics).
- Test_cross wikiPageWikiLink Gamete.
- Test_cross wikiPageWikiLink Genetic_recombination.
- Test_cross wikiPageWikiLink Genetics.
- Test_cross wikiPageWikiLink Gregor_Mendel.
- Test_cross wikiPageWikiLink Homologous_chromosome.
- Test_cross wikiPageWikiLink Meiosis.
- Test_cross wikiPageWikiLink Offspring.
- Test_cross wikiPageWikiLink Phenotype.
- Test_cross wikiPageWikiLink Ploidy.
- Test_cross wikiPageWikiLink Zygosity.
- Test_cross wikiPageWikiLink File:Punnett_Square_Test_Cross.PNG.
- Test_cross wikiPageWikiLinkText "Test cross".
- Test_cross wikiPageWikiLinkText "crossing experiments".
- Test_cross wikiPageWikiLinkText "test cross".
- Test_cross wikiPageUsesTemplate Template:Genetics-stub.
- Test_cross wikiPageUsesTemplate Template:One_source.
- Test_cross wikiPageUsesTemplate Template:Refbegin.
- Test_cross wikiPageUsesTemplate Template:Refend.
- Test_cross wikiPageUsesTemplate Template:Reflist.
- Test_cross subject Category:Classical_genetics.
- Test_cross comment "In genetics, a test cross, first introduced by Gregor Mendel, involves the breeding of a individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analyzing proportions of offspring phenotypes. Zygosity can either be heterozygous or homozygous. Those that are heterozygous have one dominant and one recessive allele.".
- Test_cross label "Test cross".
- Test_cross sameAs Q558235.
- Test_cross sameAs Test-cross.
- Test_cross sameAs لێکدانی_تاقیکاری.
- Test_cross sameAs Retrocruzamiento.
- Test_cross sameAs Atzeragurutzaketa.
- Test_cross sameAs Croisement_de_contrôle.
- Test_cross sameAs Reincrocio.
- Test_cross sameAs 검정교배.
- Test_cross sameAs Krzyżówka_testowa.
- Test_cross sameAs Cruzamento_teste.
- Test_cross sameAs m.0987lf.
- Test_cross sameAs Анализирующее_скрещивание.
- Test_cross sameAs Geri_çaprazlama.
- Test_cross sameAs Аналізуюче_схрещування.
- Test_cross sameAs Q558235.
- Test_cross wasDerivedFrom Test_cross?oldid=703931976.
- Test_cross depiction Punnett_Square_Test_Cross.PNG.
- Test_cross isPrimaryTopicOf Test_cross.