Question

Figure 12.6What are the genotypes of the individuals labeled 1, 2, and 3?

Short answer

The genotypes of the individuals labeled as 1, 2, and 3 are aa. Aa, and Aa respectively.

Step-by-step solution

Step 1. Given Introduction

It is a pedigree analysis of alkaptonuria. It is a recessive disorder in which two amino acids are not properly metabolized.

Step 2. Explanation

Genotypes of the individual labeled as 1 are aa (recessive homozygous) because it is colored blue means the individual is affected with alkaptonuria which is a recessive disorder.

The genotype of the individual labeled as 2 is Aa (heterozygous) because the individual is unaffected and when married with affected one give affected (aa) and unaffected (Aa) individual in next generation.

The genotype of the individual labeled as 3 is Aa (heterozygous) because the individual is unaffected and when married to affected one produces affected (aa) individual in the next generation.