Question 1

Eyelash length is an inherited trait.In the human population,there is an eyelash length gene.There are two possible variants of this gene - an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less) .The allele for long eyelashes is dominant (L) and the allele for short eyelashes is recessive (l) .An individual who is heterozygous for eyelash length would have which of the following genotypes?

Accepted Answer

A)  ll
B)  Ll
C)  LL
D)  Short eyelashes
E)  Long eyelashesF) A) and B)
G) A) and C)

Question 2

An X-linked gene is

Accepted Answer

A)  a gene that encodes traits seen only in females.
B)  a gene on the X chromosome.
C)  a gene found on any chromosome;they are X-shaped when they are metaphase chromosomes.
D)  a gene that is turned on (makes protein) only when the female hormone estrogen is present.
E)  a gene on the X chromosome that encodes traits seen only in females.F) A) and B)
G) None of the above

Question 3

The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called

Accepted Answer

A)  Mendelian inheritance.
B)  epistasis.
C)  genomic imprinting.
D)  linkage.
E)  dominancE.F) A) and C)
G) None of the above

Question 4

In mammals,males are ________ and females are _______ for their sex chromosomes.

Accepted Answer

A)  heterozygous,homozygous
B)  hemizygous,homozygous
C)  homozygous,heterozygous
D)  hemizygous,heterozygous
E)  heterozygous,hemizygousF) A) and B)
G) B) and D)

Question 5

A gene for sweat gland production is located on the X chromosome.A man who lacks sweat glands marries a woman who has normal sweat glands.Which of the following are possible phenotypes of their children?

Accepted Answer

A)  All of the boys will lack sweat glands.
B)  The boys will be mosaic;they will have patches of skin with sweat glands and patches of skin lacking sweat glands
C)  Half of the girls will have sweat glands and half of the girls will lack sweat glands
D)  Half of the boys will have sweat glands and half of the boys will lack sweat glands
E)  The girls will be mosaic;they will have patches of skin with sweat glands and patches of skin lacking sweat glandsF) B) and C)
G) A) and C)

Question 6

You are mapping the location of two genes in Drosophila,listless l and blind b.(l+ l+ b+ b+) and (l+ l b+ b) flies are normal,but (l l b b) flies don't move around very much and cannot detect the location of a light source.You perform a cross between a true-breeding normally active,sighted fly and a true-breeding listless,blind fly.You testcross an F1 individual with an individual homozygous recessive for both traits and get the following results:
Listless,sighted: 100
Listless,blind: 400
Normal activity,sighted: 400
Normal activity,blind: 100
The recombination frequency observed in experimental crosses can be used to indicate distances between genes on a chromosome.More specifically,the map distance in map units between two genes is equal to the frequency of recombinant offspring.What is the distance between these two genes?

Accepted Answer

A)  They are on different chromosomes.
B)  They are 10 map units apart.
C)  They are 20 map units apart.
D)  They are 40 map units apart.
E)  They are 80 map units apart.F) A) and B)
G) A) and E)

Question 7

A mutation in a single gene always has only one discrete effect on an individual's phenotype.

Accepted Answer

A) True 
 B)False

Question 8

Mendel used garden peas to study inheritance patterns,but other plants would have worked as well.Study the characteristics of the plants below,and determine which would be the best model organism to study inheritance patterns.

Accepted Answer

A)  Phalaenopsis orchids produce large,showy flowers once a year.They easily self-pollinate and produce thousands of minute seeds in their fruits.In order for orchid seeds to germinate,they must form a symbiosis with a fungus that provides it with carbohydrates,or they must be plated onto nutrient rich agar that provides a source of carbohydrates.Once germinated,plants will flower in approximately 5 years.
B)  Papayas are dioecious;they produce separate male and female plants.They flower abundantly throughout the year,and female flowers give rise to large fruits with copious seeds.Once germinated,plants will flower and bear fruit in about 1 year.
C)  Impatiens are common garden annuals that produce copious numbers of bright flowers throughout the growing season.Their flowers come in an array of different colors,they are self-fertile,and produce a fruit that is sensitive to the touch.When it is ripe,the lightest touch will cause the capsule to spring open and explosively release up to 100 seeds in all directions.This dramatic seed dispersal mechanism has given rise to its common name,touch-me-not.Impatiens have fast generation times,and a germinated seed can produce flowers in about 6 weeks.
D)  Oak trees produce thousands of flowers every year.They are wind pollinated and many oak trees will all flower simultaneously,causing a yellow haze of pollen in the air and on the surface of lakes and ponds.The large sticky stigmas receive the airborne pollen and produce 1-seeded acorns.Once an acorn germinates,the new oak can begin to flower in 3-5 years.E) A) and C)
F) B) and C)

Question 9

Environment can have an influence on the range of phenotypes seen in a population.

Accepted Answer

A) True 
 B)False

Question 10

A locus encodes different genes in different individuals of the same species.

Accepted Answer

A) True 
 B)False

Question 11

What data would you expect to see regarding the distribution of phenotypes from a cross of purple pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white;dwarf is dominant to tall. )

Accepted Answer

A)  63 purple dwarf;25 purple tall;19 white dwarf;7 white tall
B)  132 purple dwarf;138 white tall
C)  54 purple dwarf;6 white tall
D)  100% purple dwarf
E)  27 purple dwarf;28 purple tall;31 white dwarf;29 white tallF) A) and B)
G) D) and E)

Question 12

Eyelash length is an inherited trait.In the human population,there is an eyelash length gene.There are two possible variants of this gene - an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less) .The allele for long eyelashes is dominant (L) and the allele for short eyelashes is recessive (l) .An individual who is heterozygous for eyelash length would have which of the following phenotypes?

Accepted Answer

A)  ll
B)  LL
C)  Ll
D)  Long eyelashes
E)  Short eyelashesF) All of the above
G) A) and C)

Question 13

Human males produce

Accepted Answer

A)  sperm,half contain an X chromosome,half contain a Y chromosome.
B)  sperm with neither an X nor a Y;gametes do not contain sex chromosomes.
C)  gametes,all contain a Y chromosome.
D)  sperm,all contain an X chromosome.
E)  gametes,all contain both an X chromosome and a Y chromosomE.F) C) and D)
G) A) and B)

Question 14

Huntington disease is a neurodegenerative genetic disorder that typically manifests itself around age 40.A 25-year-old woman comes to your genetic counseling center because she knows that Huntington disease occurs in members of her father's family.Her paternal grandfather was afflicted,but so far her 50-year-old father shows no symptoms.Her two great-great grandmothers on her father's side were healthy well into their 90s,but one of her great-great grandfathers died of unknown causes at 45.Testing for Huntington disease is extremely expensive,but she is concerned that she may fall victim to this disease and wants to plan her life accordingly.After examining her pedigree you advise her to

Accepted Answer

A)  get tested because there is no possibility that she is homozygous.
B)  not get tested because only males in her family get the disease.
C)  get tested because her father could be a carrier.
D)  not get tested because her father is only a carrier and it is very unlikely her mother is a carrier.
E)  not get tested because her 50-year-old father shows no symptoms.F) A) and C)
G) A) and B)

Question 15

In dogs,there is a hereditary deafness caused by a recessive allele,d.A kennel owner has a male dog that she wants to use for breeding purposes if possible.The dog can hear,but the owner is unsure of the genotype.She does a testcross (crosses it to a homozygous recessive dog) ,and two of the five offspring are deaf.This means that the male dog

Accepted Answer

A)  has the genotype Dd
B)  has the genotype DD
C)  has the genotype dd
D)  is actually deaf
E)  is still of unknown genotype since there were offspring of both deaf and hearing phenotypesF) B) and C)
G) A) and E)

Question 16

If a male cat with orange fur produces female offspring with calico fur,what color was the mother cat?

Accepted Answer

A)  orange
B)  black
C)  calico
D)  black or calico
E)  orange or calicoF) All of the above
G) C) and D)

Question 17

In humans,freckles are inherited via a simple Mendelian pattern.A male is heterozygous for freckles,and he has freckles.If he marries a woman who is also heterozygous for freckles,______ percent of their children will be freckled and __________ percent of their children will be heterozygous.

Accepted Answer

A)  100%,100%
B)  75%,50%
C)  75%,25%
D)  50%,50%
E)  100%,75%F) A) and E)
G) B) and E)

Question 18

Which of the following organelle(s) has/have a genome separate from the genome in the cell nucleus?

Accepted Answer

A)  mitochondria
B)  chloroplasts
C)  nucleolus
D)  both the mitochondria and chloroplasts
E)  both the mitochondria and the nucleolusF) D) and E)
G) A) and E)

Question 19

If you were to examine a typical population at a single locus,you would find more copies of the wild-type allele than any other allele.

Accepted Answer

A) True 
 B)False

Question 20

You breed a black,long-haired rabbit with a white,short-haired rabbit.All of the offspring have long,black hair.If the genes for hair color and length are closely linked on the same chromosome,what would you expect to see in the F2 generation?

Accepted Answer

A)  15 black,long-haired: 1 black,short-haired: 1 white,long-haired: 5 white,short-haired
B)  3 black,long-haired: 1 white,short-haired
C)  9 black,long-haired: 3 black,short-haired: 3 white,long-haired: 1 white,short-haired
D)  3 black,long-haired: 9 black,short-haired: 9 white,long-haired: 1 white,short-haired
E)  All long-haired blackF) None of the above
G) C) and E)

Exam 14: Patterns of Inheritance

Environment can have an influence on the range of phenotypes seen in a population.

Correct Answer
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Correct Answer
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If a male cat with orange fur produces female offspring with calico fur,what color was the mother cat?

Correct Answer
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In mammals,males are __ and females are _ for their sex chromosomes.

Correct Answer
verified

A locus encodes different genes in different individuals of the same species.

Correct Answer
verified

A mutation in a single gene always has only one discrete effect on an individual's phenotype.

Correct Answer
verified

In humans,freckles are inherited via a simple Mendelian pattern.A male is heterozygous for freckles,and he has freckles.If he marries a woman who is also heterozygous for freckles, percent of their children will be freckled and ____ percent of their children will be heterozygous.

Correct Answer
verified

What data would you expect to see regarding the distribution of phenotypes from a cross of purple pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white;dwarf is dominant to tall. )

Correct Answer
verified

Mendel used garden peas to study inheritance patterns,but other plants would have worked as well.Study the characteristics of the plants below,and determine which would be the best model organism to study inheritance patterns.

Correct Answer
verified

A gene for sweat gland production is located on the X chromosome.A man who lacks sweat glands marries a woman who has normal sweat glands.Which of the following are possible phenotypes of their children?

Correct Answer
verified

You breed a black,long-haired rabbit with a white,short-haired rabbit.All of the offspring have long,black hair.If the genes for hair color and length are closely linked on the same chromosome,what would you expect to see in the F₂ generation?

Correct Answer
verified

The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called

Correct Answer
verified

Correct Answer
verified

Correct Answer
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An X-linked gene is

Correct Answer
verified

If you were to examine a typical population at a single locus,you would find more copies of the wild-type allele than any other allele.

Correct Answer
verified

Human males produce

Correct Answer
verified

Correct Answer
verified

Which of the following organelle(s) has/have a genome separate from the genome in the cell nucleus?

Correct Answer
verified

Correct Answer
verified

Exam 14: Patterns of Inheritance

Environment can have an influence on the range of phenotypes seen in a population.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If a male cat with orange fur produces female offspring with calico fur,what color was the mother cat?

Correct AnswerverifiedShow Answer

In mammals,males are ________ and females are _______ for their sex chromosomes.

Correct AnswerverifiedShow Answer

A locus encodes different genes in different individuals of the same species.

Correct AnswerverifiedShow Answer

A mutation in a single gene always has only one discrete effect on an individual's phenotype.

Correct AnswerverifiedShow Answer

In humans,freckles are inherited via a simple Mendelian pattern.A male is heterozygous for freckles,and he has freckles.If he marries a woman who is also heterozygous for freckles,______ percent of their children will be freckled and __________ percent of their children will be heterozygous.

Correct AnswerverifiedShow Answer

What data would you expect to see regarding the distribution of phenotypes from a cross of purple pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white;dwarf is dominant to tall. )

Correct AnswerverifiedShow Answer

Mendel used garden peas to study inheritance patterns,but other plants would have worked as well.Study the characteristics of the plants below,and determine which would be the best model organism to study inheritance patterns.

Correct AnswerverifiedShow Answer

A gene for sweat gland production is located on the X chromosome.A man who lacks sweat glands marries a woman who has normal sweat glands.Which of the following are possible phenotypes of their children?

Correct AnswerverifiedShow Answer

You breed a black,long-haired rabbit with a white,short-haired rabbit.All of the offspring have long,black hair.If the genes for hair color and length are closely linked on the same chromosome,what would you expect to see in the F2 generation?

Correct AnswerverifiedShow Answer

The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An X-linked gene is

Correct AnswerverifiedShow Answer

If you were to examine a typical population at a single locus,you would find more copies of the wild-type allele than any other allele.

Correct AnswerverifiedShow Answer

Human males produce

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following organelle(s) has/have a genome separate from the genome in the cell nucleus?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In mammals,males are __ and females are _ for their sex chromosomes.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In humans,freckles are inherited via a simple Mendelian pattern.A male is heterozygous for freckles,and he has freckles.If he marries a woman who is also heterozygous for freckles, percent of their children will be freckled and ____ percent of their children will be heterozygous.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

You breed a black,long-haired rabbit with a white,short-haired rabbit.All of the offspring have long,black hair.If the genes for hair color and length are closely linked on the same chromosome,what would you expect to see in the F₂ generation?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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