Percentages Population Place мм MN NN Inuit East Greenland 83.5 15.6 0.9 Navajo Indians New Mexico 84.5 14.4 1.1 Finns Karajala 45.7 43.1 11.2 Russians Moscow 39.9 44.0 16.1 Aborigines Queensland 2.4 30.4 67.2 Source: Data from E. B. Speiss (1990). Genes in Populations, 2nd ed. Wiley-Liss, New York.
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 human MN blood group is determined by two codominant alleles, M and N. The following data were obtained from five human populations:
A. Calculate the allele frequencies in these five populations.
B. Which populations appear to be in Hardy-Weinberg equilibrium?
C. Which populations do you think have experienced significant intermixing due to migration?
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