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#F1 generation

3 public questions tagged with this topic.

Plant Breeding 2

Heterosis is best expressed in which generation?

Heterosis manifests maximally in F1 because every locus combines divergent favorable alleles from two parental inbreds, achieving maximum heterozygosity and complementation of recessive deleterious mutations restoring pathways. Enzyme complementation, increased growth regulators and efficient partitioning produce superior biomass and yield. Mendelian segregation in F2 reduces proportion of heterozygous loci from 100 percent to 50 percent, generating mixture of homozygous genotypes expressing inbreeding depression and breaking favorable epistatic combinations formed in F1. Consequently phenotyp

Ref: Shull GH 1908 concept heterosis; Falconer Quantitative Genetics F1 vs F2; PubMed breakdown heterosis F2 generation.

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Mendelian Inheritance

In a monohybrid cross between TT × tt, the F1 generation will be

Cross between homozygous tall TT and dwarf tt parental lines provides only one allelic type per parent, T from tall and t from dwarf. Fertilisation yields uniform F1 progeny receiving T and t, genotype Tt. Because tall allele exhibits complete dominance, heterozygous phenotype resembles tall parent, dwarf allele phenotypically silent though carried. No dwarf appears, no 1:1 or 3:1 segregation yet, tall dominance explains uniformity. If tall were recessive or linked distortion expected alternate ratios, observed uniformity confirms dominance relationship. Conceptual clarity supports solving num

Ref: Pierce, Genetics, 7th ed., Chapter 3: Monohybrid F1 Dominance

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