Methods P generation Round, yellow seeds Wrinkled, green seeds RR YY rr yy Gametes RY Fertilization (b) F, generation Round, yellow seeds Rr Yy Cametes RY Self-fertilization Results generation RY ry Ry RR YY Rr Yy RR Yy Rr YY RY Rr Yy ryy Rryy r Yy ry RR Yy Rryy RR yy Rr Yy Rr YY r Yy Rr Yy YY Phenotypic ratio 9 round, yellow :3 round, green: 3 wrinkled, yellow :1 wrinkled, green
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.
figure shows the results of a dihybrid cross involving seed shape and seed color.
Q. What proportion of the round and yellow F2 progeny from this cross is homozygous at least at one locus?
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