Question 1

A human female with only one X chromosome is said to have a condition called

Accepted Answer

A) X chromosome inactivation. 
B) Angelman syndrome. 
C) Turner syndrome. 
D) Klinefelter syndrome. 
E) Down syndrome. 
A) X chromosome inactivation. 
B) Angelman syndrome. 
C) Turner syndrome. 
D) Klinefelter syndrome. 
E) Down syndrome.

Question 2

How many Barr bodies does a normal human female contain in each diploid cell?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
A) 0 
B) 1 
C) 2 
D) 3

Question 3

Any genetic differences between individuals in a population are called

Accepted Answer

A) markers. 
B) alleles. 
C) polymorphisms. 
D) SNPs. 
A) markers. 
B) alleles. 
C) polymorphisms. 
D) SNPs.

Question 4

Amniocentesis is a procedure that is normally used

Accepted Answer

A) to reduce the risk of genetic disease. 
B) for gene therapy. 
C) to change the sex of the fetus. 
D) for diagnosis of genetic disorders. 
E) for nourishing the fetus. 
A) to reduce the risk of genetic disease. 
B) for gene therapy. 
C) to change the sex of the fetus. 
D) for diagnosis of genetic disorders. 
E) for nourishing the fetus.

Question 5

Suppose you are carrying out a series of crosses with an insect where the mechanism of sex determination is unknown.You discover a mutant female with short bristles and decide to cross it with a wild type male that has normal bristles.Half of the F1 progeny have short bristles but all of these short-bristled F1 progeny are males.Based on these results,a valid hypothesis would be

Accepted Answer

A) Males are ZW,females are ZZ,and short bristles are caused by a dominant allele on the Z chromosome. 
B) Males are ZZ,females are ZW,and short bristles are caused by a recessive allele on the Z chromosome. 
C) Males are ZZ,females are ZW,and short bristles are caused by a dominant allele on the W chromosome. 
D) Males are ZZ,females are ZW,and short bristles are caused by a dominant allele on the Z chromosome. 
A) Males are ZW,females are ZZ,and short bristles are caused by a dominant allele on the Z chromosome. 
B) Males are ZZ,females are ZW,and short bristles are caused by a recessive allele on the Z chromosome. 
C) Males are ZZ,females are ZW,and short bristles are caused by a dominant allele on the W chromosome. 
D) Males are ZZ,females are ZW,and short bristles are caused by a dominant allele on the Z chromosome.

Question 6

The classic experiments performed by Creighton and McClintock in Maize

Accepted Answer

A) provided the initial evidence for genetic recombination. 
B) provided evidence that genes located on the same chromosome do not assort independently. 
C) allowed for the establishment of the first genetic map. 
D) provided evidence for the physical exchange of genetic material between homologues. 
A) provided the initial evidence for genetic recombination. 
B) provided evidence that genes located on the same chromosome do not assort independently. 
C) allowed for the establishment of the first genetic map. 
D) provided evidence for the physical exchange of genetic material between homologues.

Question 7

In the fruit fly Drosophila,there is a dominant gene for normal wings and its recessive allele for vestigial wings.At another gene locus on the same chromosome,there is a dominant gene for red eyes and its recessive allele for purple eyes.A male that was heterozygous at both gene loci was mated with a female that was homozygous for both recessive alleles and the following results were observed among the offspring:
Normal wings and red eyes - 420
Vestigial wings and red eyes - 80
Normal wings and purple eyes - 70
Vestigial wings and purple eyes - 430
According to these data,what is the distance,in centimorgans,between these 2 gene loci? (Enter the number only without the units.For example,100 cM would be entered as 100)

Accepted Answer

The answer of In the fruit fly Drosophila,there is a...

Question 8

Which of the following animals is a genetic male?

Accepted Answer

A) bird ZW 
B) grasshopper XO 
C) honeybee diploid 
D) Drosophila XXY 
A) bird ZW 
B) grasshopper XO 
C) honeybee diploid 
D) Drosophila XXY

Question 9

Hemophilia is caused by a

Accepted Answer

A) recessive allele on the X chromosome. 
B) dominant allele on the X chromosome. 
C) codominant allele on the X chromosome. 
D) recessive allele on an autosome. 
E) dominant allele on an autosome. 
A) recessive allele on the X chromosome. 
B) dominant allele on the X chromosome. 
C) codominant allele on the X chromosome. 
D) recessive allele on an autosome. 
E) dominant allele on an autosome.

Question 10

At an autosomal gene locus in humans,the allele for brown eyes is dominant over the allele for blue eyes.At another gene locus,located on the X chromosome,a recessive allele produces colorblindness while the dominant allele produces normal color vision.A heterozygous brown-eyed woman who is a carrier of colorblindness has children with a blue-eyed man who is not colorblind.What is the probability that their first child will be a blue-eyed female who has normal color vision? (Enter the probability as a percent.Enter the number only without the percent sign.For example,enter 100% as 100 and enter 12.5% as 12.5)

Accepted Answer

The answer of At an autosomal gene locus in humans,the...

Question 11

In Drosophila,the allele red eyes (bw+)is dominant to the allele for brown eyes (bw).At another gene locus on the same chromosome,the allele for thin wing veins (hv+)is dominant to the allele for heavy wing veins (hv).Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous FS1U1B11S1U1B0 progeny.
-What would be the results of a test cross with the F1 flies?

Accepted Answer

A) 1 brown eye,thin wing veins: 1 red eye,heavy wing veins 
B) 1 brown eye,heavy wing veins: 1 red eye,thin wing veins 
C) 1 brown eye,thin wing veins: 2 red eye,thin wing veins: 1 red eye,heavy wing veins 
D) 1 brown eye,heavy wing veins: 2 red eye,thin wing veins: 1 red eye,thin wing veins 
A) 1 brown eye,thin wing veins: 1 red eye,heavy wing veins 
B) 1 brown eye,heavy wing veins: 1 red eye,thin wing veins 
C) 1 brown eye,thin wing veins: 2 red eye,thin wing veins: 1 red eye,heavy wing veins 
D) 1 brown eye,heavy wing veins: 2 red eye,thin wing veins: 1 red eye,thin wing veins

Question 12

Humans who have lost one copy of an autosome are called

Accepted Answer

A) haploid. 
B) trisomic. 
C) bisomic. 
D) monosomic. 
E) monoploid. 
A) haploid. 
B) trisomic. 
C) bisomic. 
D) monosomic. 
E) monoploid.

Question 13

If you needed to determine the order of genes on a chromosome,you should perform

Accepted Answer

A) a test cross. 
B) a two-point cross. 
C) a three-point cross. 
D) a SNP test. 
A) a test cross. 
B) a two-point cross. 
C) a three-point cross. 
D) a SNP test.

Question 14

Of the 23 pairs of human chromosomes,22 pairs are homologous and are found in both males and females.These are called ________.

Accepted Answer

A) bivalents 
B) autosomes 
C) recombinant chromosomes 
D) somatic chromosomes 
A) bivalents 
B) autosomes 
C) recombinant chromosomes 
D) somatic chromosomes

Question 15

Allele pairs are most likely to assort independently of one another when

Accepted Answer

A) they control unrelated traits. 
B) they control related traits. 
C) they are on the same chromosome. 
D) they are sex-linked. 
E) they are on different chromosomes. 
A) they control unrelated traits. 
B) they control related traits. 
C) they are on the same chromosome. 
D) they are sex-linked. 
E) they are on different chromosomes.

Question 16

In Drosophila,dosage compensation is controlled by the male-specific lethal (MSL)complex consisting of MSL proteins and roX RNAs.Based on what you know about dosage compensation,the role of the MSL complex in males would be to

Accepted Answer

A) double the level of expression of genes on the X chromosome. 
B) increase the level of expression of genes on the X chromosome by 50%. 
C) decrease the level of expression of genes on the X chromosome by 50%. 
D) decrease the level of expression of genes on the X chromosome by 100%. 
E) double the level of expression of genes on the Y chromosome. 
A) double the level of expression of genes on the X chromosome. 
B) increase the level of expression of genes on the X chromosome by 50%. 
C) decrease the level of expression of genes on the X chromosome by 50%. 
D) decrease the level of expression of genes on the X chromosome by 100%. 
E) double the level of expression of genes on the Y chromosome.

Question 17

In 1910,Morgan did a series of experiments with the fruit fly Drosophila,an organism where females are XX and males are XY.When a mutant male fly with white eyes was crossed with a wild type female with red eyes,none of the F1 progeny had white eyes but 18% of the F2 progeny had white eyes.Unexpectedly,all of these white-eyed F2 flies were males.Based on these results,Morgan concluded that white eyes is caused by a recessive X-linked allele.Suppose Morgan had found that half of the F1 progeny had white eyes but all of these white-eyed F1 flies were females.In this case,a valid hypothesis would be

Accepted Answer

A) White eyes is caused by a recessive Y-linked allele. 
B) White eyes is caused by a dominant Y-linked allele. 
C) White eyes is caused by a dominant X-linked allele. 
D) White eyes is caused by a dominant autosomal allele. 
A) White eyes is caused by a recessive Y-linked allele. 
B) White eyes is caused by a dominant Y-linked allele. 
C) White eyes is caused by a dominant X-linked allele. 
D) White eyes is caused by a dominant autosomal allele.

Question 18

________ is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age.

Accepted Answer

A) Cystic fibrosis 
B) Sickle cell anemia 
C) Tay-Sachs disease 
D) Huntington's disease 
E) Hemophilia 
A) Cystic fibrosis 
B) Sickle cell anemia 
C) Tay-Sachs disease 
D) Huntington's disease 
E) Hemophilia

Exam 13: Chromosomes, mapping, and the Meiosisinheritance Connection

A human female with only one X chromosome is said to have a condition called

How many Barr bodies does a normal human female contain in each diploid cell?

Any genetic differences between individuals in a population are called

Amniocentesis is a procedure that is normally used

The classic experiments performed by Creighton and McClintock in Maize

Which of the following animals is a genetic male?

Hemophilia is caused by a

Humans who have lost one copy of an autosome are called

If you needed to determine the order of genes on a chromosome,you should perform

Of the 23 pairs of human chromosomes,22 pairs are homologous and are found in both males and females.These are called ________.

Allele pairs are most likely to assort independently of one another when

In Drosophila,dosage compensation is controlled by the male-specific lethal (MSL)complex consisting of MSL proteins and roX RNAs.Based on what you know about dosage compensation,the role of the MSL complex in males would be to

________ is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age.

The Science of Biology

The Nature of Molecules and the Properties of Water

The Chemical Building Blocks of Life

Cell Structure

Membranes

Energy and Metabolism

How Cells Harvest Energy

Photosynthesis

Cell Communication

How Cells Divide

Sexual Reproduction and Meiosis

Patterns of Inheritance

Dna: the Genetic Material

Genes and How They Work

Control of Gene Expression

Biotechnology

Genomics

Cellular Mechanisms of Development

Genes Within Populations

The Evidence for Evolution

The Origin of Species

Systematics,phylogenies,and Comparative Biology

Genome Evolution

The Origin and Diversity of Life

Viruses

Prokaryotes

Protists

Seedless Plants

Seed Plants

Fungi

Animal Diversity and the Evolution of Body Plans

Protostomes

Deuterostomes

Plant Form

Transport in Plants

Plant Nutrition and Soils

Plant Defense Responses

Sensory Systems in Plants

Plant Reproduction

The Animal Body and Principles of Regulation

The Nervous System

Sensory Systems

The Endocrine System

The Musculoskeletal System

The Digestive System

The Respiratory System

The Circulatory System

Osmotic Regulation and the Urinary System

The Immune System

The Reproductive System

Animal Development

Behavioral Biology

Ecology of Individuals and Populations

Community Ecology

Dynamics of Ecosystems

The Biosphere and Human Impacts

Conservation Biology

Filters