Albinism is a recessive disorder in which the skin and hair fail to produce pigment.The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism.The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
-What is Deirdre's phenotype?
A)nn
B)Albino
C)Normal
D)Cannot be determined

Question

Albinism is a recessive disorder in which the skin and hair fail to produce pigment.The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism.The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder. 
-What is Deirdre's phenotype?
A)nn 
B)Albino 
C)Normal 
D)Cannot be determined

Quizplus · Accepted Answer

Deirdre's phenotype is shaded, indicating that she expresses the disorder, which is caused by the recessive allele "n". Therefore, Deirdre must be homozygous recessive (nn) and is an albino.

Albinism Is a Recessive Disorder in Which the Skin and Hair