Figure 5.13: A sex-limited characteristic is encoded by autosomal genes that are expressed in only one sex. An example is cock feathering in chickens, an autosomal recessive trait that is limited to males. (a) Cock-feathered male. (b) Hen-feathered female. (c) Hen-feathered male.
[Part a: superstarjet/Getty Images. Part b: Guy Sagi/istockphoto. Part c: James Marshall/Corbis.]