Question 1

An organism with three sets of complete chromosomes is

Accepted Answer

A) aneuploid. 
B) diploid. 
C) trisomic. 
D) triassic. 
E) triploid. 
A) aneuploid. 
B) diploid. 
C) trisomic. 
D) triassic. 
E) triploid.

Question 2

Use the following information to answer the questions below.
A plant-like organism on the planet Pandora has three recessive genetic traits: bluish leaves, due to an allele (a) of gene A; a feathered stem, due to an allele (b) of gene B; and hollow roots due to an allele (c) of gene C. The three genes are linked and, when a geneticist did a testcross with an organism that had been found to be heterozygous for the three recessive traits, she was able to identify progeny with the following phenotypic distribution (+ = wild type):
  
-In which progeny phenotypes has there been recombination between genes A and B?

Accepted Answer

A) 1, 2, 5, and 6 
B) 1, 3, 6, and 7 
C) 2, 4, 5, and 8 
D) 2, 3, 5, and 7 
E) in all 8 of them 
A) 1, 2, 5, and 6 
B) 1, 3, 6, and 7 
C) 2, 4, 5, and 8 
D) 2, 3, 5, and 7 
E) in all 8 of them

Question 3

Thomas Hunt Morgan's choice of Drosophila melanogaster has been proven to be useful even today. Which of the following has/have continued to make it a most useful species? I. its four pairs of chromosomes
II. a very large number of visible as well as biochemically mutant phenotypes
III. easy and inexpensive maintenance
IV. short generation time and large number of offspring

Accepted Answer

A) I and IV only 
B) II and III only 
C) I, II, and III only 
D) II, III, and IV only 
E) I, II, III, and IV 
A) I and IV only 
B) II and III only 
C) I, II, and III only 
D) II, III, and IV only 
E) I, II, III, and IV

Question 4

Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early 20th century?

Accepted Answer

A) Individuals inherit particular chromosomes attached to genes. 
B) Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis. 
C) Homologous chromosomes give rise to some genes and crossover chromosomes to other genes. 
D) No more than a single pair of chromosomes can be found in a healthy normal cell. 
E) Natural selection acts on certain chromosome arrays rather than on genes. 
A) Individuals inherit particular chromosomes attached to genes. 
B) Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis. 
C) Homologous chromosomes give rise to some genes and crossover chromosomes to other genes. 
D) No more than a single pair of chromosomes can be found in a healthy normal cell. 
E) Natural selection acts on certain chromosome arrays rather than on genes.

Question 5

What is the source of the extra chromosome 21 in an individual with Down syndrome?

Accepted Answer

A) nondisjunction in the mother only 
B) nondisjunction in the father only 
C) duplication of the chromosome 
D) nondisjunction or translocation in either parent 
E) It is impossible to detect with current technology. 
A) nondisjunction in the mother only 
B) nondisjunction in the father only 
C) duplication of the chromosome 
D) nondisjunction or translocation in either parent 
E) It is impossible to detect with current technology.

Question 6

A gene is considered to be non-Mendelian in its inheritance pattern if it seems to "violate" Mendel's laws. Which of the following would be considered Mendelian?

Accepted Answer

A) a gene whose expression varies depending on the gender of the transmitting parent 
B) a gene derived solely from maternal inheritance 
C) a gene transmitted via the cytoplasm or cytoplasmic structures 
D) a gene transmitted to males from the maternal line and from fathers to daughters 
E) a gene transmitted by a virus to egg-producing cells 
A) a gene whose expression varies depending on the gender of the transmitting parent 
B) a gene derived solely from maternal inheritance 
C) a gene transmitted via the cytoplasm or cytoplasmic structures 
D) a gene transmitted to males from the maternal line and from fathers to daughters 
E) a gene transmitted by a virus to egg-producing cells

Exam 15: The Chromosomal Basis of Inheritance

An organism with three sets of complete chromosomes is

Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early 20th century?

What is the source of the extra chromosome 21 in an individual with Down syndrome?

A gene is considered to be non-Mendelian in its inheritance pattern if it seems to "violate" Mendel's laws. Which of the following would be considered Mendelian?

Introduction: Evolution and Themes of Biology

The Chemical Context of Life

Water and Life

Carbon and the Molecular Diversity of Life

The Structure and Function of Large Biological Molecules

A Tour of the Cell

Membrane Structure and Function

An Introduction to Metabolism

Cellular Respiration and Fermentation

Photosynthesis

Cell Communication

The Cell Cycle

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Molecular Basis of Inheritance

From Gene to Protein

Regulation of Gene Expression

Viruses

Dna Tools and Biotechnology

Genomes and Their Evolution

Descent With Modification: a Darwinian View of Life

The Evolution of Populations

The Origin of Species

The History of Life on Earth

Phylogeny and the Tree of Life

Bacteria and Archaea

Protists

Plant Diversity I: How Plants Colonized Land

Plant Diversity Ii: the Evolution of Seed Plants

Fungi

An Overview of Animal Diversity

An Introduction to Invertebrates

The Origin and Evolution of Vertebrates

Plant Structure, Growth, and Development

Resource Acquisition and Transport in Vascular Plants

Soil and Plant Nutrition

Angiosperm Reproduction and Biotechnology

Plant Responses to Internal and External Signals

Basic Principles of Animal Form and Function

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Osmoregulation and Excretion

Hormones and the Endocrine System

Animal Reproduction

Animal Development

Neurons, Synapses, and Signalling

Nervous Systems

Sensory and Motor Mechanisms

Animal Behaviour

An Introduction to Ecology and the Biosphere

Population Ecology

Community Ecology

Ecosystems and Restoration Ecology

Conservation Biology and Global Change

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