In pineapples, leaves may be spiny, spiny-tipped or piping. Pineapples of different phenotypes were used in the following crosses: P1 phenotype piping X spiny P1 genotype ______ ______ F1 phenotype 100% piping F1 genotype ______ Crossing the F1s produced: F2 phenotypes F2 genotypes 95 piping _______ 25 spiny tipped _______ 8 spiny _______
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.
TOPIC: GENE INTERACTION AND EPISTASIS
In pineapples, leaves may be spiny, spiny-tipped or piping. Pineapples of different
P1 phenotype piping X spiny
P1 genotype ______ ______
F1 phenotype 100% piping
F1 genotype ______
Crossing the F1s produced:
F2 phenotypes F2 genotypes
95 piping _______
25 spiny tipped _______
8 spiny _______
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