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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

In Section 12.3, “Laws of Inheritance,” an example of epistasis was given for the summer squash. Cross white WwYy heterozygotes to prove the phenotypic ratio of 12 white:3 yellow:1 green that was given in the text.

Figure 12.16 In pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y) are dominant to green peas (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares do you need to do a Punnett square analysis of this cross?

Imagine you are performing a cross involving seed color in garden pea plants. What F1offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over the green.

a. 100 percent yellow-green seeds

b. 100 percent yellow seeds

c. 50 percent yellow, 50 percent green seeds

d. 25 percent green, 75 percent yellow seeds

The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one-quarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

  1. multiple alleles and incomplete dominance

  2. codominance and incomplete dominance

  3. incomplete dominance only

  4. multiple alleles and codominance

Explain epistasis in terms of its Greek-language roots “standing upon.”
See all solutions

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