How do you work out the genotypes of a person in a pedigree?

Can you determine someone’s genotype based on a pedigree?

By analyzing a pedigree, we can determine genotypes, identify phenotypes, and predict how a trait will be passed on in the future. The information from a pedigree makes it possible to determine how certain alleles are inherited: whether they are dominant, recessive, autosomal, or sex-linked.

How do you determine a person’s genotype?

Knowing the Genotype: Punnett Square


How do you determine the genotype of a parent?

To construct a Punnett square, the genotypes of both parents must be known. One parent’s alleles are listed across the top of the table, and the other parent’s alleles are listed down the left hand side. The resulting offspring genotypes are produced at the intersection of the parent’s alleles.

What are the genotypes of a human?

A description of the pair of alleles in our DNA is called the genotype. Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA, AO, BB, BO, AB, and OO.

What is genotype example?

Genotype examples

A gene encodes eye color. … If the child inherits two different alleles (heterozygous) then they will have brown eyes. For the child to have blue eyes, they must be homozygous for the blue eye allele.

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How do you write y linked genotype?

Males with the trait will have the genotype XYR and males without the trait will have the genotype XYr (with the allele on the Y). The alleles are not dominant over one another so the R and r were just randomly assigned as a symbol to represent each allele.