From Sandra Childress
Feedback (21 November)
may have learnt elementary genetics not wisely but too well.
The advertisement for The Economist is referring to phenotype, not
genotype. “Blue eyes from mother” means one blue-eye gene from the mother, who
is apparently also blue-eyed, and one blue-eye gene from the father, whom we
must presume to be brown-eyed (or green-eyed) but heterozygous—carrying
one (recessive) blue-eye gene.
Tetbury, Gloucestershire
