Figure 3.

Samples of genotype charts and corresponding blank pedigree charts.

a) For a dominant trait. Examples of dominant disease in humans include Marfan Syndrome, Alzheimer's disease, and amylotrophic lateral sclerosis or Lou Gehrig's disease.

b) For a recessive trait. Examples in humans include cystic fibrosis, sickle cell anemia, and albinism.

c) Another example of a pedigree chart for a recessive trait

d) For a sex-linked recessive trait. Examples in humans include hemophilia, and many types of color-blindness including the most common red-green form. note the mutant allele is labelled Xh

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