mosome constitution. When the seed parent was O. hookeri, the plastids of the progeny were yellow; but when the seed parent was O. muricata, the plastids of the progeny were green. How might this difference in the results of reciprocal crosses
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.
Renner carried out reciprocal crosses between two types of the evening primrose, Oenothera hookeri and O. muricata, known to have the same chromosome constitution. When the seed parent was O. hookeri, the plastids of the progeny were yellow; but when the seed parent was O. muricata, the plastids of the progeny were green. How might this difference in the results of reciprocal crosses be explained?
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