The production of eye-color pigment in Drosophila requires the dominant allele A. The dominant allele P of a second independent gene turns the pigment to purple, but its recessive allele leaves it red. A fly producing no pigment has white eyes. Two pure lines were crossed with the following results:P red-eyed female white-eyed maleF1 purple-eyed femalesred-eyed malesF1 F1purple eyed 38red eyed 38white eyed 28F both males and females: 2Explain this mode of inheritance, and show the genotypes of the parents, the F1, and the F2.
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
The production of eye-color pigment in Drosophila requires the dominant allele A. The dominant allele P of a
second independent gene turns the pigment to purple,
but its recessive allele leaves it red. A fly producing no
pigment has white eyes. Two pure lines were crossed
with the following results:
P red-eyed female white-eyed male
F1 purple-eyed females
red-eyed males
F1 F1
purple eyed 3
8
red eyed 3
8
white eyed 2
8
F both males and females: 2
Explain this mode of inheritance, and show the genotypes
of the parents, the F1, and the F2.
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