Question 1

If an allele is dominant, then

Accepted Answer

A)  its phenotype is only expressed in heterozygous individuals. 
B)  its phenotype is expressed only in homozygous individuals. 
C)  its phenotype masks the expression of the recessive allele in a hybrid. 
D)  its phenotype is always expressed in all generations. 
E)  its phenotype is more beneficial than the recessive phenotype. 
A)  its phenotype is only expressed in heterozygous individuals. 
B)  its phenotype is expressed only in homozygous individuals. 
C)  its phenotype masks the expression of the recessive allele in a hybrid. 
D)  its phenotype is always expressed in all generations. 
E)  its phenotype is more beneficial than the recessive phenotype. C

Question 2

Match between columns
                        Premises: The differences in traits observed in parents versus offspring

Accepted Answer

The Answer of Phenotype and Heredity and Locus and Allele is...

Question 3

A cross of two medium height hybrid plants produces offspring that are dwarf, medium, and tall in a ratio of 1:2:1. This is an example of

Accepted Answer

A)  variegation. 
B)  hybrid vigor. 
C)  incomplete dominance. 
D)  epistasis. 
E)  a polygenic trait. 
A)  variegation. 
B)  hybrid vigor. 
C)  incomplete dominance. 
D)  epistasis. 
E)  a polygenic trait. C

Question 4

A gene that affects, prevents, or masks the expression of a gene at another locus is a(n) ____ gene.

Accepted Answer

A)  recessive 
B)  dominant 
C)  epistatic 
D)  codominant 
E)  pleiotropic 
A)  recessive 
B)  dominant 
C)  epistatic 
D)  codominant 
E)  pleiotropic

Question 5

The zygote and early embryonic cells of female mammals have how many X chromosomes?

Accepted Answer

A)  Three 
B)  One 
C)  Two 
D)  Five 
E)  Seven 
A)  Three 
B)  One 
C)  Two 
D)  Five 
E)  Seven

Question 6

If a couple is planning on having two children, what is the probability that both will be male?

Accepted Answer

A)  0 
B)  1/4 
C)  1/2 
D)  3/4 
E)  1 
A)  0 
B)  1/4 
C)  1/2 
D)  3/4 
E)  1

Question 7

A gene that controls seed coat color in peas also determines the susceptibility of these peas to a particular disease. This situation is referred to as

Accepted Answer

A)  variegation. 
B)  polygenic inheritance. 
C)  codominance. 
D)  pleiotropy. 
E)  incomplete dominance. 
A)  variegation. 
B)  polygenic inheritance. 
C)  codominance. 
D)  pleiotropy. 
E)  incomplete dominance.

Question 8

The range of phenotypic possibilities that can develop from a certain dog genotype under different environmental conditions is called the

Accepted Answer

A)  epistatic interaction. 
B)  norm of reaction. 
C)  nurture limit. 
D)  genotype range. 
E)  maximum phenotype. 
A)  epistatic interaction. 
B)  norm of reaction. 
C)  nurture limit. 
D)  genotype range. 
E)  maximum phenotype.

Question 9

Mendel's principle of independent assortment describes the separation of paired factors during the formation of gametes.

Accepted Answer

A) True 
 B)False

Question 10

In humans, a mutation in the phenylalanine hydroxylase gene causes phenylketonuria (PKU), which is characterized by a wide variety of medical problems. This is an example of epistasis.

Accepted Answer

A) True 
 B)False

Question 11

A Barr body in a mammalian female cell represents a(n)

Accepted Answer

A)  inactivated oocyte. 
B)  polar body. 
C)  degenerate nucleus. 
D)  inactivated X chromosome. 
E)  inactivated Y chromosome. 
A)  inactivated oocyte. 
B)  polar body. 
C)  degenerate nucleus. 
D)  inactivated X chromosome. 
E)  inactivated Y chromosome.

Question 12

Match between columns
                        Premises: Heterozygous individuals have a phenotype that is intermediate between the parental phenotypes.

Accepted Answer

The Answer of Codominance and Polygenic inheritance and Pleiotropy and is...

Question 13

What are the predicted phenotypes of the male children from the union of a woman who is heterozygous for hemophilia and a man who has normal blood clotting characteristics? (Use the Punnett square to verify your answer.)

Accepted Answer

A)  All male children will be healthy. 
B)  3 healthy:1 hemophilia 
C)  1 hemophilia:1 healthy 
D)  1 hemophilia:3 healthy 
E)  All male children will have hemophilia. 
A)  All male children will be healthy. 
B)  3 healthy:1 hemophilia 
C)  1 hemophilia:1 healthy 
D)  1 hemophilia:3 healthy 
E)  All male children will have hemophilia.

Question 14

What is dosage compensation with respect to the sex chromosomes? Briefly explain how this is accomplished in humans.

Accepted Answer

Dosage combination equalizes the express

Question 15

If a cell has two X chromosomes, XIST will become active in one of them, producing a special type of regulatory RNA molecule known as long noncoding RNA..

Accepted Answer

A) True 
 B)False

Question 16

A pear plant with the genotype Aa can produce gametes containing

Accepted Answer

A)  either A or Aa. 
B)  only the dominant A. 
C)  only the recessive a. 
D)  either A or a. 
E)  either AA, Aa, or aa. 
A)  either A or Aa. 
B)  only the dominant A. 
C)  only the recessive a. 
D)  either A or a. 
E)  either AA, Aa, or aa.

Question 17

The probability that two genes will be separated by crossing-over is related to

Accepted Answer

A)  the phenotype that they control. 
B)  how far the two genes are from the centromere. 
C)  the distance between the two genes on the chromosome. 
D)  whether the two genes are located on a sex chromosome. 
E)  how far the genes are from the kinetochore. 
A)  the phenotype that they control. 
B)  how far the two genes are from the centromere. 
C)  the distance between the two genes on the chromosome. 
D)  whether the two genes are located on a sex chromosome. 
E)  how far the genes are from the kinetochore.

Question 18

All calico cats are female because

Accepted Answer

A)  two recessive X-linked genes are required for the calico phenotype. 
B)  Y-linked genes prevent the expression of the calico phenotype. 
C)  the calico phenotype is caused by random X chromosome inactivation. 
D)  the calico phenotype is a Y-linked trait. 
E)  one X chromosome and one Y chromosome are needed for the expression of the calico phenotype. 
A)  two recessive X-linked genes are required for the calico phenotype. 
B)  Y-linked genes prevent the expression of the calico phenotype. 
C)  the calico phenotype is caused by random X chromosome inactivation. 
D)  the calico phenotype is a Y-linked trait. 
E)  one X chromosome and one Y chromosome are needed for the expression of the calico phenotype.

Question 19

Which describes the interaction between genes such that the presence of certain alleles in one locus affects the expression of certain alleles in the other locus?

Accepted Answer

A)  Pleiotropy 
B)  Epistasis 
C)  Polygenic inheritance 
D)  Norm of reaction 
E)  Codominance 
A)  Pleiotropy 
B)  Epistasis 
C)  Polygenic inheritance 
D)  Norm of reaction 
E)  Codominance

Question 20

In rabbits, coat color is governed by four alleles: C for dark gray, Cch for chinchilla, Ch for Himalayan, and c for white. Each individual rabbit inherits a combined total of _____ coat color allele(s) from its parents.

Accepted Answer

A)  zero 
B)  one 
C)  two 
D)  three 
E)  four 
A)  zero 
B)  one 
C)  two 
D)  three 
E)  four

Exam 11: The Basic Principles of Heredity

If an allele is dominant, then

A cross of two medium height hybrid plants produces offspring that are dwarf, medium, and tall in a ratio of 1:2:1. This is an example of

A gene that affects, prevents, or masks the expression of a gene at another locus is a(n) ____ gene.

The zygote and early embryonic cells of female mammals have how many X chromosomes?

If a couple is planning on having two children, what is the probability that both will be male?

A gene that controls seed coat color in peas also determines the susceptibility of these peas to a particular disease. This situation is referred to as

The range of phenotypic possibilities that can develop from a certain dog genotype under different environmental conditions is called the

Mendel's principle of independent assortment describes the separation of paired factors during the formation of gametes.

In humans, a mutation in the phenylalanine hydroxylase gene causes phenylketonuria (PKU), which is characterized by a wide variety of medical problems. This is an example of epistasis.

A Barr body in a mammalian female cell represents a(n)

What are the predicted phenotypes of the male children from the union of a woman who is heterozygous for hemophilia and a man who has normal blood clotting characteristics? (Use the Punnett square to verify your answer.)

What is dosage compensation with respect to the sex chromosomes? Briefly explain how this is accomplished in humans.

If a cell has two X chromosomes, XIST will become active in one of them, producing a special type of regulatory RNA molecule known as long noncoding RNA..

A pear plant with the genotype Aa can produce gametes containing

The probability that two genes will be separated by crossing-over is related to

All calico cats are female because

Which describes the interaction between genes such that the presence of certain alleles in one locus affects the expression of certain alleles in the other locus?

In rabbits, coat color is governed by four alleles: C for dark gray, Cch for chinchilla, Ch for Himalayan, and c for white. Each individual rabbit inherits a combined total of _____ coat color allele(s) from its parents.

A View of Life

Atoms and Molecules: the Chemical Basis of Life

The Chemistry of Life: Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp: Energy-Releasing Pathways

Photosynthesis: Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

DNA: The Carrier of Genetic Information

Gene Expression

Gene Regulation

DNA Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity: Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

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An Introduction to Animal Diversity

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Plant Structure, Growth, and Development

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Reproduction in Flowering Plants

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Animal Structure and Function: an Introduction

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The Immune System: Internal Defense

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Animal Development

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Introduction to Ecology: Population Ecology

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Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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In rabbits, coat color is governed by four alleles: C for dark gray, C^ch for chinchilla, C^h for Himalayan, and c for white. Each individual rabbit inherits a combined total of _____ coat color allele(s) from its parents.