Let’s first examine gene interactio

Let
’
s
fi
rst examine gene interaction in which genes at two loci
interact to produce a single characteristic. Fruit color in the
pepper
Capsicum annuum
is determined in this way. This
plant produces peppers in one of four colors: red, brown, yel-
low, or green. If a homozygous plant with red peppers is
crossed with a homozygous plant with green peppers, all the
F
1
plants have red peppers
(F
IGURE
5.6a)
. When the F
1
are
crossed with one another, the F
2
are in a ratio of 9 red : 3
brown : 3 yellow : 1 green
(F
IGURE
5.6b)
. This dihybrid ra-
tio (Chapter 3) is produced by a cross between two plants
that are both heterozygous for two loci (
RrCc

RrCc
). In
peppers, a dominant allele
R
at the
fi
rst locus produces a red
pigment; the recessive allele
r
at this locus produces no red
pigment. A dominant allele
C
at the second locus causes de-
composition of the green pigment chlorophyll; the recessive
allele
c
allows chlorophyll to persist. The genes at the two loci
then interact to produce the colors seen in F
2
peppers:

Results (English) 1:

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:

Results (English) 2:

Let
'
s
fi
rst examine gene interaction in the which genes at two loci
berinteraksi to produce a single characteristic. Fruit color in the
pepper
Capsicum annuum
is determined in this way. This
plant produces peppers in one of four colors: red, brown, yel-
low, or green. If a homozygous plant with red peppers is
crossed with a homozygous plant with green peppers, all the
F
1
plants have red peppers
(F
IGURE
5.6a)
. When the F
1
are
crossed with one another, the F
2
are in a ratio of 9 red: 3
brown: yellow 3: 1 green
(F
IGURE
5.6b)
. This dihybrid ra-
tio (Chapter 3) is produced by a cross between two plants
that are both heterozygous for two loci (
RrCc
?
RrCc
). In
peppers, a dominant allele
R
at the
fi
rst locus produces a red
pigment; the recessive allele
r
at this locus produces no red
pigment. A dominant allele
C
at the second locus causes de-
composition of the green pigment chlorophyll; the recessive
allele
c
Allows chlorophyll to persist. The genes at the two loci
then berinteraksi to produce the colors seen in F
2
peppers: