In water melon, red fruit colour (R) is dominant over cream fruit colour (r). A water
melon plant homozygous for red fruits is crossed with a plant homozygous for
cream fruits. The F1 are intercrossed to produce F2.
(a) Give the genotypes and phenotypes of the parents, the F1, and the F2.
(b) Give the genotypes and phenotypes of the offspring of a backcross
between the F1, and the red fruit colour homozygous parent.
(c) Give the genotypes and phenotypes of a backcross between the F1, and the
cream fruit colour homozygous parent.
genotypic ratio Parental genotype
1:2:1 Aa × Aa
1:1 Aa × aa, AA x Aa
Uniform progeny
AA × AA, aa × aa, AA × aa
In cucumbers, orange fruit color (R) is dominant over cream fruit color (r). A cucumber plant homozygous for orange fruit is crossed with a plant homozygous for cream fruit. The F1 are intercrossed to produce the F2.
a. Give the genotypes and phenotypes of the parents, the F1, and the F2.
The cross of a homozygous cucumber plant that produces orange fruit
(RR) with a homozygous cucumber plant that produces cream fruit (rr) will result in an F1 generation heterozygous for the orange
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