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Chapter 12: Q. 2 (page 326)

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

Short Answer

Expert verified

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

Step by step solution

01

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.

02

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.

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Most popular questions from this chapter

The gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is dominant to terminal, list all of the possible F1 and F2 genotypes and phenotypes from a cross involving parents that are homozygous for each trait. Express genotypes with conventional genetic abbreviations.

A recessive trait will be observed in individuals that are ________ for that trait.

a. heterozygous

b. homozygous or heterozygous

c. homozygous

d. diploid

A heterozygous pea plant produces violet flowers and yellow, round seeds. Describe the expected genotypes of the gametes produced by Mendelian inheritance. If all three genes are found on the same arm of one chromosome should a scientist predict that inheritance patterns will follow Mendelian genetics?

Why is it more efficient to perform a test cross with a homozygous recessive donor than a homozygous dominant donor? How could the same information still be found with a homozygous dominant donor?

Which is one of the seven characteristics that Mendel observed in pea plants?

a. flower size

b. seed texture

c. leaf shape

d. stem color
See all solutions

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