BIOL 2301 Lecture Notes - Lecture 2: Dihybrid Cross, Letter Case, Phenotype
30 Aug 2016
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Said they don"t blend: said they were discrete factors. Had been interbreeding for generations (farmers: become true breeding: Each two copies of genes/each allele are the same: homozygous at all genes. Every single pea in a pod are the result of individual fertilizations: allows for multiple offspring and variability. Can take pollen from one plant and put on other or vice versa. In peas, reciprocal crosses are equal: same result in f1 generation, because don"t have different sexes. F1 exhibits only one parental trait: no intermediate phenotype (blending) In a cross between f1 peas, mendel found that both parental traits re-appear in f2 generation. One parental phenotype disappear in f1, then reappeared in f2. Capital letter = dominant: copy of gene that gives dominant phenotype. Gene: name for sequence of dna that codes for proteins: come in different variants = alleles. Two copies of each gene: each possible copy is allele.
