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He found that almost 80% of the colour variation across generations had a genetic basis (i.e., was heritable and independent of phenotypic plasticity), and appeared to be governed by a single gene whereby the ‘brown’ allele dominates the ‘grey’ one.

In demographic terms, brown morphs in their reproductive age increased from 24 (12% of the population) to 348 (42%) individuals in Finland over the study period, and such increase was of similar magnitude in the study region and was not due to the arrival of foreign individuals from elsewhere (according to capture-mark-recapture data). Upper panels show the proportion of brown morphs (relative to the total number of brown and grey morphs) ringed from 1960 to 2010 [left], and the depth of the snow layer in the study area between 19 [right].

The lower-right panel presents data for 318 offspring re-captured as adults and for which the colouration of their parents was known (BB = both brown, GG = both grey, BG = one brown one grey): bars furthest to the left show observed frequencies of the two morphs, and the remaining bars represent theoretical (i.e., model-based) frequencies assuming that plumage colour is determined by one single gene (with brown or grey as dominant, middle bars), or by the additive effect of multiple genes (bars furthest to the right).

The brown-dominant, single-gene model predicts theoretical frequencies closest to observed frequencies.) depend on how much snow falls, particularly for brown individuals.

And it wasn’t just the pictures; your explanations of why you’re wearing what you’re wearing have gotten so sophisticated!