BIOC15H3 Lecture Notes - Lecture 3: William Bateson, Lentil, Dihybrid Cross

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When f1 is self-crossed, f1 yields f2 with: F1 of monohybrid are heterozygous for 1 gene [ex: aa] Phenotypic ratio 3 [dominant]: 1 [recessive] When f1 is self-crosses, f1 yields f2 with: F1 of dihybrid cross are heterozygous for 2 genes [ex: rryy] R_y_ (1rryy, 2rryy, 2rryy, 1rryy) rry_ (1rryy, 2rryy) Mendel"s work published in 1865 and discovered in early 1900"s. William bateson treasure your expectation b/c they help you extend what is already known . Let"s look at monohybrid crosses phenotype ratio exceptions. Look @ allele"s dominance relation [term dominant/recessive] by looking @ phenotype in heterozygote. Dominant allele: alleles that completely finds phenotype when present in both homo/heterozygotes. Recessive allele: non-apparent allele, completely hidden unless it"s only version present. Incomplete dominance: heterozygote shows blended, intermediate phenotype b/w 2 parental phenotypes. Due to way protein products of 2 alleles interact & not blending of genes. F2 [from f1 self-cross] - genotypic ratio is same [1:2:1].

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