II 2 3 5 6 II 4 5 IV [Source: L. M. Ashley and R. S. Jacques. 1950. Joumal of Heredity 41:83.] 3.

Type 1 albinism in humans is a rare hereditary condition associated with a reduced amount of active tyrosinase, an enzyme required for the conversion of the amino acid tyrosine to the dark pigment melanin. In the pedigree above, males are indicated by squares, females by circles and individuals with type 1 albinism are indicated by shading. Use A and a for the dominant (sufficient active tyrosinase) and recessive alleles (absent or insufficient tyrosinase activity), respectively. Remember that, when genotype is not known for a dominant phenotype, an m-dash is used (A- = AA or Aa). Match the genotypes of the indicated family members as specifically as possible based on the pedigree data. Except where necessary to explain the pedigree, assume that the individuals marrying into the family are homozygous wild-type. v Individual A - v Individual B 1. A- v Individual C 2. Aa Individual C v Individual E

Cystic fibrosis (CF) is an autosomal recessive trait. A three-generation pedigree is shown below for a family that carries the mutant allele for cystic fibrosis. Note that carriers are not colored in to allow you to figure out their genotypes.      Normal allele =  F      CF mutant allele =  f        What is the genotype of individual #13? A) ff B) FF C) Ff  D) it is impossible to tell

In certain species of horses, a roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Which type type of inheritance does this example represent?