Question 1

In humans,brown eyes (B) is a simple dominant trait over blue eyes (b) .What is the genotype of a brown-eyed woman who has a blue-eyed child?

Accepted Answer

A)  bb.
B)  Bb.
C)  BB.
D)  BBB.
E)  BbBb.F) A) and E)
G) A) and C)

Question 2

Some plants fail to produce chlorophyll,due to a recessive trait.If we locate a pea plant that is heterozygous for this trait,self-pollinate it,and harvest the seeds,what are the likely phenotypes of the resulting offspring?

Accepted Answer

A)  All will be green with chlorophyll since that is the dominant trait.
B)  All will be white and lack chlorophyll since this is self-pollinated.
C)  About one-half will be green and one-half white since that is the distribution of the genes in the parents.
D)  About one-fourth will be white and three-fourths green since it is similar to a monohybrid cross.
E)  About one-fourth will be green and three-fourths white since it is similar to a monohybrid cross.F) All of the above
G) A) and C)

Question 3

When two or more sets of alleles affect the same trait in an additive fashion,it is termed

Accepted Answer

A)  a single-trait cross.
B)  a double-trait cross.
C)  codominant.
D)  incomplete dominance.
E)  polygenic inheritance.F) A) and C)
G) None of the above

Question 4

You have two true-breeding rose bushes,one with red flowers and one with white flowers.A cross between these two roses yields a bush with white flowers that have red splotches.What condition does this demonstrate?

Accepted Answer

A)  codominance
B)  incomplete dominance
C)  environmental effects
D)  polygenetic inheritance
E)  monohybrid inheritanceF) C) and D)
G) D) and E)

Question 5

In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F2 offspring?

Accepted Answer

A)  monohybrid cross
B)  dihybrid cross
C)  test cross
D)  homozygous recessive * homozygous dominant
E)  homozygous dominant *heterozygousF) None of the above
G) All of the above

Question 6

Which of the following is an example of the blending of phenotypes?

Accepted Answer

A)  codominance
B)  sex-linked inheritance
C)  polygenic inheritance
D)  simple Mendelian inheritance
E)  incomplete dominanceF) None of the above
G) B) and C)

Question 7

In the human population,short fingers are dominant over long fingers.Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

Accepted Answer

The female's genotype would be...

Question 8

In a testcross,an organism with a dominant phenotype,but unknown genotype is crossed with which of the following to establish its genotype?

Accepted Answer

A)  homozygous dominant
B)  heterozygous
C)  homozygous recessive
D)  heterozygous dominant
E)  monohybrid dominantF) B) and E)
G) A) and B)

Question 9

Which of the following represents the physical characteristics of the individual?

Accepted Answer

A)  phenotype
B)  genotype
C)  alleles
D)  homozygous
E)  dominanceF) A) and B)
G) A) and C)

Question 10

Which of the following is NOT correct concerning the law of independent assortment?

Accepted Answer

A)  It is based upon the process of meiosis.
B)  Each pair of factors separates independently.
C)  All possible combinations of factors can occur in the gametes.
D)  It was the second law of heredity established by Mendel.
E)  It follows the observation that all maternal chromosomes end up in the egg.F) All of the above
G) B) and C)

Question 11

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.A heterozygous black,short-haired animal reproduces with a brown,long-haired animal.What is the expected phenotypic ratio of the offspring?

Accepted Answer

A)  1 black short hair,1 black long hair,1 brown short hair,1 brown long hair
B)  3 black short hair,1 brown long hair,3 black long hair,1 brown short hair
C)  9 black short hair,3 black long hair,3 brown long hair,1 brown short hair
D)  9 black short hair,3 black long hair,3 brown short hair,1 brown long hair
E)  9 black short hair,6 black long hair,3 brown long hair,1 brown short hairF) A) and B)
G) A) and C)

Question 12

In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F2 offspring?

Accepted Answer

A)  monohybrid cross
B)  dihybrid cross
C)  test cross
D)  homozygous recessive *homozygous dominant
E)  homozygous dominant * heterozygousF) B) and D)
G) B) and C)

Question 13

Huntington disease is an autosomal dominant disorder that leads to progressive degeneration of brain cells.There is no effective treatment for the disorder and individuals usually die in their 40s or 50s,10 to 15 years after the onset of symptoms.Which of these statements about Huntington disease is true?

Accepted Answer

A)  As an autosomal dominant disease,Huntington disease is expressed only if both parents carry the trait.
B)  Huntington disease usually skips a generation.
C)  Huntington disease can only be inherited when a parent is showing the trait.
D)  Huntington disease usually appears during middle age.
E)  Huntington disease is caused by a defect in the elastic connective tissue protein.F) B) and E)
G) C) and D)

Question 14

In a Mendelian monohybrid cross involving two homozygous genotypes,the ____ generation is always completely heterozygous.

Accepted Answer

A)  F1
B)  F2
C)  F3
D)  P
E)  P2F) A) and E)
G) A) and C)

Question 15

Indicate the phenotypic and genotypic ratios expected for the offspring from a straight-haired man and a wavy-haired woman.

Accepted Answer

Straight and curly hair are incompletely...

Question 16

In peas,yellow is dominant over green in seeds.With which of these is it best to cross a yellow-seeded pea plant to determine whether it is homozygous or heterozygous?

Accepted Answer

A)  a green-seeded plant
B)  a heterozygous yellow-seeded plant
C)  a pure yellow-seeded plant
D)  a heterozygous yellow-seeded plant or a pure yellow-seeded plant
E)  There is no way to determine if the plant is pure or hybrid.F) A) and E)
G) B) and E)

Question 17

In 1940,two researchers named Weiner and Landsteiner discovered that about 85 percent of the human population sampled possessed a blood cell protein called the Rh factor.The presence of Rh factor was labeled Rh positive (Rh+) and was found to be dominant over the absence of the blood factor (Rh-) .Under normal Mendelian inheritance,which of the following statements is/are FALSE?

Accepted Answer

A)  Two Rh+ parents could have an Rh- child.
B)  Two Rh- parents could have an Rh+ child.
C)  An Rh- child would require that both parents be carriers of at least one Rh- allele.
D)  It is possible with just one pair of parents to have children where some siblings are Rh- and some are Rh+.
E)  Two Rh+ parents can have Rh- or Rh+ children.F) B) and C)
G) A) and C)

Question 18

For Mendel's law of segregation to occur,the alleles must be

Accepted Answer

A)  at different loci on the same chromosome.
B)  at the same loci on the same chromosome.
C)  on a nonhomologous pair of chromosomes.
D)  on a homologous pair of chromosome at the same loci.
E)  on different loci on different chromosomes.F) A) and D)
G) None of the above

Question 19

Mendel carried out most of his research with

Accepted Answer

A)  livestock.
B)  pea plants.
C)  guinea pigs.
D)  fruit flies.
E)  bacteria.F) C) and D)
G) B) and E)

Question 20

If pairs of factors separate independently of other pairs of factors,you are dealing with

Accepted Answer

A)  the law of segregation.
B)  the law of independent assortment.
C)  the law of dominance.
D)  multiple alleles.
E)  codominance.F) B) and D)
G) B) and C)

Exam 23: Patterns of Gene Inheritance

When two or more sets of alleles affect the same trait in an additive fashion,it is termed

Correct Answer
verified

In peas,yellow is dominant over green in seeds.With which of these is it best to cross a yellow-seeded pea plant to determine whether it is homozygous or heterozygous?

Correct Answer
verified

In humans,brown eyes (B) is a simple dominant trait over blue eyes (b) .What is the genotype of a brown-eyed woman who has a blue-eyed child?

Correct Answer
verified

Which of the following is NOT correct concerning the law of independent assortment?

Correct Answer
verified

In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F₂ offspring?

Correct Answer
verified

In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F₂ offspring?

Correct Answer
verified

If pairs of factors separate independently of other pairs of factors,you are dealing with

Correct Answer
verified

Which of the following is an example of the blending of phenotypes?

Correct Answer
verified

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.A heterozygous black,short-haired animal reproduces with a brown,long-haired animal.What is the expected phenotypic ratio of the offspring?

Correct Answer
verified

Some plants fail to produce chlorophyll,due to a recessive trait.If we locate a pea plant that is heterozygous for this trait,self-pollinate it,and harvest the seeds,what are the likely phenotypes of the resulting offspring?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In a testcross,an organism with a dominant phenotype,but unknown genotype is crossed with which of the following to establish its genotype?

Correct Answer
verified

Mendel carried out most of his research with

Correct Answer
verified

Which of the following represents the physical characteristics of the individual?

Correct Answer
verified

For Mendel's law of segregation to occur,the alleles must be

Correct Answer
verified

Indicate the phenotypic and genotypic ratios expected for the offspring from a straight-haired man and a wavy-haired woman.

Correct Answer
verified
Straight and curly hair are incompletely...
View Answer

You have two true-breeding rose bushes,one with red flowers and one with white flowers.A cross between these two roses yields a bush with white flowers that have red splotches.What condition does this demonstrate?

Correct Answer
verified

In the human population,short fingers are dominant over long fingers.Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

Correct Answer
verified
The female's genotype would be...
View Answer

In a Mendelian monohybrid cross involving two homozygous genotypes,the ____ generation is always completely heterozygous.

Correct Answer
verified

Exam 23: Patterns of Gene Inheritance

When two or more sets of alleles affect the same trait in an additive fashion,it is termed

Correct AnswerverifiedShow Answer

In peas,yellow is dominant over green in seeds.With which of these is it best to cross a yellow-seeded pea plant to determine whether it is homozygous or heterozygous?

Correct AnswerverifiedShow Answer

In humans,brown eyes (B) is a simple dominant trait over blue eyes (b) .What is the genotype of a brown-eyed woman who has a blue-eyed child?

Correct AnswerverifiedShow Answer

Which of the following is NOT correct concerning the law of independent assortment?

Correct AnswerverifiedShow Answer

In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F2 offspring?

Correct AnswerverifiedShow Answer

In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F2 offspring?

Correct AnswerverifiedShow Answer

If pairs of factors separate independently of other pairs of factors,you are dealing with

Correct AnswerverifiedShow Answer

Which of the following is an example of the blending of phenotypes?

Correct AnswerverifiedShow Answer

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.A heterozygous black,short-haired animal reproduces with a brown,long-haired animal.What is the expected phenotypic ratio of the offspring?

Correct AnswerverifiedShow Answer

Some plants fail to produce chlorophyll,due to a recessive trait.If we locate a pea plant that is heterozygous for this trait,self-pollinate it,and harvest the seeds,what are the likely phenotypes of the resulting offspring?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In a testcross,an organism with a dominant phenotype,but unknown genotype is crossed with which of the following to establish its genotype?

Correct AnswerverifiedShow Answer

Mendel carried out most of his research with

Correct AnswerverifiedShow Answer

Which of the following represents the physical characteristics of the individual?

Correct AnswerverifiedShow Answer

For Mendel's law of segregation to occur,the alleles must be

Correct AnswerverifiedShow Answer

Indicate the phenotypic and genotypic ratios expected for the offspring from a straight-haired man and a wavy-haired woman.

Correct AnswerverifiedStraight and curly hair are incompletely...View AnswerShow Answer

You have two true-breeding rose bushes,one with red flowers and one with white flowers.A cross between these two roses yields a bush with white flowers that have red splotches.What condition does this demonstrate?

Correct AnswerverifiedShow Answer

In the human population,short fingers are dominant over long fingers.Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

Correct AnswerverifiedThe female's genotype would be...View AnswerShow Answer

In a Mendelian monohybrid cross involving two homozygous genotypes,the ____ generation is always completely heterozygous.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F₂ offspring?

Correct Answer
verified

In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F₂ offspring?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Straight and curly hair are incompletely...
View Answer

Correct Answer
verified

Correct Answer
verified
The female's genotype would be...
View Answer

Correct Answer
verified