In 1964, the biologists Paul Ehrlich and Holm pointed out <answer>cases where two or more clines are distributed discordantly</answer>—for example, melanin is distributed in a decreasing pattern from the equator north and south; frequencies for the haplotype for beta-S hemoglobin, on the other hand, radiate out of specific geographical points in Africa. As the anthropologists Leonard Lieberman and Fatimah Linda Jackson observed, "Discordant patterns of heterogeneity falsify any description of a population as if it were genotypically or even phenotypically homogeneous".
What did two biologists point out in 1964?
cases where two or more clines are distributed discordantly