Question 1

Explain why a female can be heterozygous for an X-linked gene but a male cannot.

Accepted Answer

Females have two X chromosomes and two a

Question 2

A person with only one allele for a recessive condition who does not have the condition is called a ________.

Accepted Answer

The answer of A person with only one allele for...

Question 3

If a zygote has the genotype XYY,how many total chromosomes were in the sperm before it fused with the egg?

Accepted Answer

A) 20 
B) 21 
C) 22 
D) 23 
E) 24 
A) 20 
B) 21 
C) 22 
D) 23 
E) 24

Question 4

Refer to the figure below, and then answer the question that follows.
  
-Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers.Which event is likely to produce a higher percentage of abnormal gametes?

Accepted Answer

A) failure of homologous chromosomes to separate at meiosis I 
B) failure of homologous chromosomes to separate at meiosis II 
C) failure of sister chromatids to separate at meiosis I 
D) failure of sister chromatids to separate at meiosis II 
E) failure of sister chromatids to separate at mitosis 
A) failure of homologous chromosomes to separate at meiosis I 
B) failure of homologous chromosomes to separate at meiosis II 
C) failure of sister chromatids to separate at meiosis I 
D) failure of sister chromatids to separate at meiosis II 
E) failure of sister chromatids to separate at mitosis

Question 5

In humans,aneuploidy is fairly common yet goes largely unrecognized as a genetic problem.This is because:

Accepted Answer

A) it produces autosomal recessive individuals who don't always express the disorder. 
B) its effects are usually hidden. 
C) it actually produces healthy individuals. 
D) it often results in miscarriage of embryos. 
A) it produces autosomal recessive individuals who don't always express the disorder. 
B) its effects are usually hidden. 
C) it actually produces healthy individuals. 
D) it often results in miscarriage of embryos.

Question 6

A person must have two alleles for hemoglobin S in order to suffer from sickle-cell anemia.

Accepted Answer

A) True 
 B)False

Question 7

In a pedigree chart,a darkened square demonstrates a:

Accepted Answer

A) diseased male. 
B) diseased female. 
C) normal male. 
D) normal female. 
A) diseased male. 
B) diseased female. 
C) normal male. 
D) normal female.

Question 8

A chromosome that has been broken and has lost a section has had a/an:

Accepted Answer

A) aneuploidy. 
B) inversion. 
C) deletion. 
D) duplication. 
E) translocation. 
A) aneuploidy. 
B) inversion. 
C) deletion. 
D) duplication. 
E) translocation.

Question 9

A carrier for a genetic disorder will pass the allele to all of their offspring.

Accepted Answer

A) True 
 B)False

Exam 12: Units of Heredity: Chromosomes and Inheritance

Explain why a female can be heterozygous for an X-linked gene but a male cannot.

A person with only one allele for a recessive condition who does not have the condition is called a ________.

If a zygote has the genotype XYY,how many total chromosomes were in the sperm before it fused with the egg?

Refer to the figure below, and then answer the question that follows. -Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers.Which event is likely to produce a higher percentage of abnormal gametes?

In humans,aneuploidy is fairly common yet goes largely unrecognized as a genetic problem.This is because:

A person must have two alleles for hemoglobin S in order to suffer from sickle-cell anemia.

In a pedigree chart,a darkened square demonstrates a:

A chromosome that has been broken and has lost a section has had a/an:

A carrier for a genetic disorder will pass the allele to all of their offspring.

Science As a Way of Learning: a Guide to the Natural World

Fundamental Building Blocks: Chemistry, water, and Ph

Lifes Components: Biological Molecules

Lifes Home: the Cell

Lifes Border: the Plasma Membrane

Lifes Mainspring: an Introduction to Energy

Vital Harvest: Deriving Energy From Food

The Green Worlds Gift: Photosynthesis

The Links in Lifes Chain: Genetics and Cell Division

Preparing for Sexual Reproduction: Meiosis

The First Geneticist: Mendel and His Discoveries

Passing on Lifes Information: Dna Structure and Replication

How Proteins Are Made: Genetic Transcription, translation, and Regulation

The Future Isnt What It Used to Be: Biotechnology

An Introduction to Evolution: Charles Darwin, evolutionary Thought, and the Evidence for Evolution

The Means of Evolution: Microevolution

The Outcomes of Evolution: Macroevolution

A Slow Unfolding: the History of Life on Earth

Arriving Late,traveling Far: the Evolution of Human Beings

Viruses,bacteria,archaea,and Protists: the Diversity of Life 1

Fungi: the Diversity of Life 2

Animals: the Diversity of Life 3

Plants: the Diversity of Life 4

The Angiosperms: Form and Function in Flowering Plants

Body Support and Movement: the Integumentary, skeletal, and Muscular Systems

Communication and Control 1: the Nervous System

Communication and Control 2: the Endocrine System

Defending the Body: the Immune System

Transport and Exchange 1: Blood and Breath

Transport and Exchange 2: Digestion, nutrition, and Elimination

An Amazingly Detailed Script: Animal Development

How the Baby Came to Be: Human Reproduction

An Interactive Living World 1: Populations in Ecology

An Interactive Living World 2: Communities in Ecology

An Interactive Living World 3: Ecosystems and Biomes

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