Chapter 10 Quiz Answers

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What is the map distance between two genes with a recombination frequency of 0.08?
a. 8 cM
Textbook Reference: 10.4 What Is the Relationship Between Genes and Chromosomes? p. 224


A dramatic departure from expected phenotypic ratios may be the result of
e. All of the above
Textbook Reference: 10.2 How Do Alleles Interact? pp. 217–219 and 10.3 How Do Genes Interact? pp. 219–222


Genes that are found in organelles such as mitochondria, are usually inherited in what fashion.
b. From the mother
Textbook Reference: 10.5 What Are the Effects of Genes Outside the Nucleus? p. 228


The 9:3:3:1 ratio is obtained
b. in a dihybrid cross in which the genes are on different chromosomes.
Textbook Reference: 10.1 What Are the Mendelian Laws of Inheritance? p. 211


___ is the term meaning an allele that has more than one distinguishable phenotypic effect.
a. Pleiotropy
Textbook Reference: 10.2 How Do Alleles Interact? p. 219


A woman of blood group A has a child with a man of blood group B. The child's blood is type O. What must be the genotype of the parents?
c. Mother: IAio; father: IBio
Textbook Reference: 10.2 How Do Alleles Interact? p. 219 and Figure 10.13


Different genes always assort independently whether the genes reside on the same chromosome or on different chromosomes.
b. False
Textbook Reference: 10.1 What Are the Mendelian Laws of Inheritance? p. 213 and 10.4 What is the Relationship Between Genes and Chromosomes? p. 223


Coat color in mice involves the effects of multiple gene interactions. If a mouse has two recessive alleles (aa) for coat color, it is always albino no matter what the genotype is for the other genes involved in coat color. This is an example of
d. epistasis.
Textbook Reference: 10.3 How Do Genes Interact? p. 219


In humans, brown spotting of teeth is caused by a dominant sex-linked (X-linked) gene. If a man with brown teeth marries a woman with normal teeth ___ have brown teeth.
c. all of their daughters
Textbook Reference: 10.4 What is the Relationship Between Genes and Chromosomes? p. 226


Unattached earlobes are a dominant trait. Finn and Maggie both have unattached earlobes but their daughter Celia does not. If Finn and Maggie have a second child, what is the probability that it will have attached earlobes?
a. One-fourth
Textbook Reference: 10.1 What Are the Mendelian Laws of Inheritance? p. 211


In a test cross, peas of an unknown genotype are crossed with peas of a known genotype. In this example, smooth peas are the unknown and wrinkled peas are the known (rr). If half of the offspring from that cross are smooth and half are wrinkled, what is the genotype of the unknown plant?
d. Heterozygous: Rr
Textbook Reference: 10.1 What Are the Mendelian Laws of Inheritance? p. 213


Wild type fruit flies have red eyes. In a genetics experiment, you cross a white-eyed female fly with a red-eyed male fly. You then examine the phenotypes of the F1 generation and find that all of the females are red-eyed and all of the males are white-eyed. What type of inheritance pattern is this?
e. Sex-linked on X chromosome
Textbook Reference: 10.4 What is the Relationship Between Genes and Chromosomes? p. 226


In pea plants, the gene for yellow seeds, Y, is dominant to the allele for green seeds, y. A plant with green seeds must have the genotype
c. yy.
Textbook Reference: 10.1 What Are the Mendelian Laws of Inheritance? p. 209


You are examining three different genes, a, b, and c. They all reside on the same chromosome and you want to know the order of the genes along the chromosome. You determine that genes a and b are 10 cM apart, b and c are 2 cM apart and that a and c are 8 cM apart. What is the order of these genes?
b. a, c, b
Textbook Reference: 10.4 What is the Relationship Between Genes and Chromosomes? pp. 224–225


Homologous chromosomes in meiosis
d. can adopt two different alignments.
Textbook Reference: 10.1 What Are the Mendelian Laws of Inheritance? p. 213


The fact that a trait like height in humans varies over a wide range of values is due to
c. multiple alleles, and the environmental influences on the expression of these genes.
Textbook Reference: 10.3 How Do Genes Interact? p. 221


Codominance
b. involves the expression of both alleles at a locus producing two different phenotypes.
Textbook Reference: 10.2 How Do Alleles Interact? p. 219


Incomplete dominance
a. results in a phenotypic ratio of 1:2:1 in a monohybrid cross.
Textbook Reference: 10.2 How Do Alleles Interact? p. 218


What fraction of offspring of the cross AaBb × AaBb is homozygous for all the dominant alleles, assuming that they are on different chromosomes?
c. 1/16
Textbook Reference: 10.1 What Are the Mendelian Laws of Inheritance? p. 213 and Figure 10.7


In many animals, including humans, sex is determined by a single ___, or by a pair of them. Both males and females have two copies of each of the rest of the chromosomes, which are called
c. sex chromosome; autosomes.
Textbook Reference: 10.4 What Is the Relationship Between Genes and Chromosomes? p. 225


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