Brachidactyly – shortening of the phalanges of the fingers. A healthy person has two dominant BB genes; therefore, skeletal development occurs normally. In heterozygotes (Bb), shortening of the phalanges of the fingers is observed, and in recessive homozygotes (bb), multiple disorders in the development of the skeleton are manifested, and such people die in early childhood. Thus, gene B does not completely suppress the action of gene b, and therefore, heterozygotes develop brachidactyly. In this case, there is an incomplete dominance.
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