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The Inheritance Pattern for an Autosomal Dominant Trait Is Shown in the Pedigree. Shaded Symbols Represent Individuals That Express the

Question

The inheritance pattern for an autosomal dominant trait is shown in the pedigree. Shaded symbols represent individuals that express the dominant trait. square square square square square Based on this pedigree what are the most likely genotypes of individuals I-1 and 1-2 F 1-1: aa 1-2: Aa G I-1: AA 1-2: Aa H 1-1 Aa 1-2 aa 1-1 1-2 AA

Answer

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Verificación de expertos
Mitchell Veteran · Tutor for 9 years

Answer

I-1: aaI-2: Aa

Explanation

## Step1In autosomal dominant inheritance, the trait is not linked to the sex of the offspring. Instead, the trait can express itself in either one or two copies of the gene.## Step2The individuals I-1 and I-2 do not express the trait, indicating that their phenotype is "a", the recessive trait.## Step3An individual showing the dominant trait could have a genotype of either "Aa" or "AA".## Step4For someone who does not show the trait, their genotype would definitely be "aa" because it's a recessive trait.## Step5Given that the trait in genotype "Aa" is not expressed, it can be inferred that this genotype is recessive. This leads to the conclusion that the genotype of these individuals is "aa".