Below is a pedigree of a family with a disorder of unknown inheritance. Note that individual 11 is known to have no affected alleles.
X^A X^a and X^A X^A are the possible genotypes of individual 1.
An autosomal pedigree depicts the transmission of all qualities other than the sex-linked traits, whereas a sex-linked pedigree depicts the transmission of sex-linked traits among generations. In general, the autosomal pattern of inheritance and the pattern of inheritance of sex-linked traits are highly dissimilar. Because males have an X and a Y chromosome, even a single allele would result in the appearance of a trait in them, the sex-related traits actually occur more frequently in males than in females. Usually, carriers are females.
Using pedigrees, one can determine how a given trait is passed down through a family. A trait's existence or absence as it relates to the link between parents, children, and siblings can be seen in pedigrees. Pedigrees use standardized symbols to denote family members and connections. We can ascertain genotypes, recognize phenotypes, and forecast how a trait will be passed down in the future by studying a pedigree. A pedigree's information can be used to assess an allele's mode of inheritance, such as whether it is dominant, recessive, autosomal, or sex-linked.
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