BIO152H5 Lecture Notes - Lecture 6: Antirrhinum, Zygosity, Chlorophyll
Document Summary
Lecture 6 more complex patterns of dominance. One of the two parental alleles show complete dominance over the other. In such situations, the phenotypes of the heterozygote ad the dominant homozygotes are indistinguishable. For some genes, neither allele is completely dominant, and the f1 hybrids have a phenotype somewhere between the two parental varieties => called incomplete dominance. [red + white snapdragons = pink snapdragons] -> supports blending hypothesis of inheritance, which would predict that red and white could be retrieved from pink flowers. Produces heterozygote phenotype that is a combination of 2 homozygotes. Called dominant" because it is seen in the phenotype, not because it subdues a recessive allele. Alleles are variation in a gene"s nucleotide sequence. When a dominant allele coexists with a recessive in a heterozygous, they do not actually interact at all. Its in the pathway from when genotype -> phenotype (thats when the dominant or recessive come into play)
