View the above sex-linked recessive pedigree. Can you be certain of generation I, individual #1’s genotype? Why or why not? All males receive their X chromosome from their How are sex-linked pedigrees different from autosomal pedigrees? How many dominant alleles does an individual need in order to have the autosomal dominant trait? Is it possible to know the genotypes of the three children in generation III? Should their shapes be shaded?