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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

How would you perform a reciprocal cross for the characteristic of stem height in the garden pea?

In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant:heterozygous: homozygous recessive) would you expect to observe in the offspring?

a. 1:2:1

b. 3:1:1

c. 1:2:0

d. 0:2:1

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

The forked line and probability methods make use of what probability rule?

a. test cross

b. product rule

c. monohybrid rule

d. sum rule

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.
See all solutions

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