BIOB 375 1st Edition Lecture 25 Outline of Last Lecture II. Two gene loci Outline of Current Lecture III. Epistasisa. Recessive and dominantb. Duplicate dominantCurrent LectureEpistasis- The effect of gene interaction that one gene masks the effect of another gene at a different locusWhat is different from dominance?At least on locus is homozygous recessive in the offspring, ratio = 9:7Recessive epistasis- Bombay phenotype- Genotypes at both the H locus in the example and the ABO locus determine the ABO blood typeDominant epistasis- The color of summer squash is controlled by two loci: the W locus and the Y locus- White:Yellow:Green= (9+3):3:1 = 12:3:1Duplicate dominant epistasis- Resistant: susceptible ~ 15:1Two loci determine a single characteristic, interaction between genes produces new phenotypes9 red: 3 peach: 3 orange: 1 creamImportant to REMEMBER!!!
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