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Let’s fiRST examine gene interaction in which genes at two lociNational interact to produce a single last. Fruit color in thepepper Capsicum annuumis determined in this way. Thisthe plant produces peppers in one of four colors: red, brown, gratefullow, or green. If a homozygous plant with red peppers iscrossed with a homozygous plant with green peppers, all theF1plants have red peppers (FIGURE5.6 a). When the F1arecrossed with one another, the F2are in a ratio of 9:3 redBrown: 3 yellow: 1 green (FIGURE5.7 b). This dihybrid ra-TIO (Chapter 3) is produced by a cross between two plantsthat are both heterozygous for two loci (RrCcRrCc). InPeppers, a dominant allele Rat the fiRST locus produces a redpigment; the recessive allele rat this locus, produces no redpigment. A dominant allele Cat the second locus causes de-composition of the green pigment chlorophyll; the recessiveallele callows chlorophyll to persist. The genes at the two locithen national interact to produce the colors seen in F2Peppers:
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