Unusual genetic disorder inheritance explained

Key terms
Pedigree Chart that shows the presence or absence of a trait within a family across generations
Genotype The genetic makeup of an organism (ex: TT)
Phenotype The physical characteristics of an organism (ex: tall)
Dominant allele Allele that is phenotypically expressed over another allele
Recessive allele Allele that is only expressed in absence of a dominant allele
Autosomal trait Trait that is located on an autosome (non-sex chromosome)
Sex-linked trait Trait that is located on one of the two sex chromosomes
Homozygous Having two identical alleles for a particular gene
Heterozygous Having two different alleles for a particular gene