You go to the supermarket to buy your favorite fruit, the mango, and see all kinds of crazy mangos of different colors--yellow, green, orange, and white ones! You do some nutty genetics studies and find that color is inherited according to an allelic series, where yellow (Y) is dominant to orange (yº), which is dominant to green (yG), which is dominant to white (yW). You decide to cross a yellow mango plant with an orange mango plant. This cross produced 2 yellow mangoes, a green mango, and an orange mango. What could the parent plants' genotypes be? Yyw and yoyw O YyG and yoyw Yyw and yoyG Yyw and yoyG
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.
Dominant and recessive are terms used for alleles. A dominant gene allele when present in an organism masks the expression of other alleles. Only one copy of a dominant gene is enough to express its phenotype. For example in this case yellow is dominant over other colors so if there is a gene present for yellow color of mango then other genes will not express themselves even if present in the organism. But they will be able to pass down from one generation to the other.
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