BLOODTYPES
An allele is one of several different forms of genetic information that is present in our DNA at a specific location on a specific chromosome. Human blood type can determined through co-dominant alleles. In fact, human possess three different alleles for human blood type, which include A, B, and O. Now everyone of us possess two ABO blood type alleles, since we each inherited one blood type allele from our biological mother and one from our biological father. Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus.
COLOR BLINDNESS
Color blindness is generally a X-linked recessive trait. In fact, red-green color perception defect is the result of a mutation on the X-chromosome, yet the defect manifest itself only upon females when both X-chromosomes are mutant. Males, in comparison, would inherit red-green color blindness if they inherited only one mutant X-chromosome with the defect. Essentially, color blindness is a sex-linked trait.
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