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WS 137 simple Markup Comments changes. Reviewing pane 1. Which of the following descriptions of a Y-linked trait in humans is comect? a All the sons or an affected rather will be affected with the trait bu Half the sons of a mother whose father was affected with the trait will be affected. c. Half the sons of an affected father will not be affected with the trait and the other half will be infertile. d All the daughters of an affected father will be phenotypically normal themselves but half of their own sons will be affected with the trait. 2. If the pedigree is for an autosomal recessive characteristic, which individuals are definitel heterozygous? a. I-1, -2, II-2, II-4, and II-55 bu I-1, I-2, I-4, III-1 d. II-2, II4, II-5, II-3 3. Could the characteristics followed in the pedigree be caused by an x-linked recessive allele? a. Yes, all individuals fit the X-linked recessive inheritance pattern.