Question 1

Mendel's understanding of the inheritance of traits in peas,expressed in modern language,included all of the following except

Accepted Answer

A) parents transmit information encoded in genes. 
B) each individual contains two genes for each trait. 
C) not all genes are identical;alternative forms (alleles)exist. 
D) each of the alleles present in an individual is discrete. 
E) if a given allele is present,its effects will be seen in the individual. 
A) parents transmit information encoded in genes. 
B) each individual contains two genes for each trait. 
C) not all genes are identical;alternative forms (alleles)exist. 
D) each of the alleles present in an individual is discrete. 
E) if a given allele is present,its effects will be seen in the individual.

Question 2

If you crossed flies heterozygous for the Cy allele,what surviving genotypes would you find in the F2 generation?

Accepted Answer

A) Cy+/Cy+ 
B) Cy/Cy+ 
C) Cy+/Cy+ and Cy/Cy+ 
D) Cy+/Cy+,Cy/Cy+,and Cy/Cy 
A) Cy+/Cy+ 
B) Cy/Cy+ 
C) Cy+/Cy+ and Cy/Cy+ 
D) Cy+/Cy+,Cy/Cy+,and Cy/Cy

Question 3

Mendel's first law encompasses all of the following except

Accepted Answer

A) alternative forms of trait are encoded by alternative alleles. 
B) alternative alleles segregate in gametes. 
C) either allele has equal probability to be passed on into the gamete. 
D) all genes found in an individual are not separable into gametes. 
A) alternative forms of trait are encoded by alternative alleles. 
B) alternative alleles segregate in gametes. 
C) either allele has equal probability to be passed on into the gamete. 
D) all genes found in an individual are not separable into gametes.

Question 4

An allele that is present but unexpressed is

Accepted Answer

A) redundant. 
B) dominant. 
C) functional. 
D) epistatic. 
E) recessivE. 
A) redundant. 
B) dominant. 
C) functional. 
D) epistatic. 
E) recessivE.

Question 5

The ________ of an organism is the physical appearance resulting from the expression of the genes present.

Accepted Answer

A) phenotype 
B) genotype 
C) plasticity 
D) karyotype 
A) phenotype 
B) genotype 
C) plasticity 
D) karyotype

Question 6

Sometimes one gene pair will interact so as to control the expression of a second gene pair in an interaction called

Accepted Answer

A) dominance. 
B) gene regulation. 
C) recessiveness. 
D) pleiotropy. 
E) epistasis. 
A) dominance. 
B) gene regulation. 
C) recessiveness. 
D) pleiotropy. 
E) epistasis.

Question 7

A diploid individual carrying two different alleles on its homologous chromosomes.

Accepted Answer

A) genotype 
B) heterozygote 
C) homozygote 
D) phenotype 
A) genotype 
B) heterozygote 
C) homozygote 
D) phenotype

Question 8

A diploid organism that has two identical alleles for the same trait is called _______ for that particular trait.

Accepted Answer

A) homozygous 
B) heterozygous 
C) dominant 
D) recessive 
E) codominant 
A) homozygous 
B) heterozygous 
C) dominant 
D) recessive 
E) codominant

Question 9

When the two haploid gametes contain two different alleles of a given gene,the resulting offspring is called

Accepted Answer

A) discrete. 
B) a haploid. 
C) heterozygous. 
D) homozygous. 
E) a fused allelE. 
A) discrete. 
B) a haploid. 
C) heterozygous. 
D) homozygous. 
E) a fused allelE.

Question 10

As a genetic counselor,you are constructing a human pedigree for a particular disease.You note that every generation shows the trait,suggesting that it is

Accepted Answer

A) sex-linked. 
B) recessive. 
C) dominant. 
D) cannot determine from the information provideD. 
A) sex-linked. 
B) recessive. 
C) dominant. 
D) cannot determine from the information provideD.

Question 11

The observable outward manifestation of the genes of an individual is referred to as its

Accepted Answer

A) blueprint. 
B) genotype. 
C) phenotype. 
D) genetic map. 
A) blueprint. 
B) genotype. 
C) phenotype. 
D) genetic map.

Question 12

Let P = purple flowers and p = white,and T = tall plants and t = dwarf.What combinations of gametes could be produced by a heterozygote for both the traits?

Accepted Answer

A) PpTt only 
B) Pp,Tt 
C) P,p,T,t 
D) PT,Pt,pT,pt 
E) infertile,no gametes produced 
A) PpTt only 
B) Pp,Tt 
C) P,p,T,t 
D) PT,Pt,pT,pt 
E) infertile,no gametes produced

Question 13

An individual possessing both kinds of alleles of two different traits is called

Accepted Answer

A) homozygote. 
B) monohybrid. 
C) dihybrid. 
D) true breeD. 
E) diallelic. 
A) homozygote. 
B) monohybrid. 
C) dihybrid. 
D) true breeD. 
E) diallelic.

Question 14

The Principle of ________ states that alternative alleles for a trait segregate from one another during gamete formation and remain distinct.

Accepted Answer

A) Alleles 
B) Segregation 
C) Crossing over 
D) Randomization 
A) Alleles 
B) Segregation 
C) Crossing over 
D) Randomization

Question 15

A gene for a particular trait that is only expressed in the presence of another gene of the same kind is called a(n)

Accepted Answer

A) dominant gene. 
B) codominant gene. 
C) incompletely dominant gene. 
D) recessive gene. 
E) multiple allelE. 
A) dominant gene. 
B) codominant gene. 
C) incompletely dominant gene. 
D) recessive gene. 
E) multiple allelE.

Question 16

The phenotypic ratio for a testcross with a homozygous individual and a heterozygous individual is _______.

Accepted Answer

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

Question 17

When Mendel crossed two purple-flowered pea plants with each other,he obtained a phenotypic ratio of 3:1 (purple-flowered pea plants to white-flowered pea plants).His results are consistent with which of the following sets of parents?

Accepted Answer

A) homozygous dominant purple pea plant and homozygous recessive white pea plant 
B) homozygous dominant purple pea plant and heterozygous white pea plant 
C) heterozygous purple pea plant and homozygous recessive white pea plant 
D) heterozygous purple pea plant and homozygous dominant purple pea plant 
E) heterozygous purple pea plant and heterozygous purple pea plant 
A) homozygous dominant purple pea plant and homozygous recessive white pea plant 
B) homozygous dominant purple pea plant and heterozygous white pea plant 
C) heterozygous purple pea plant and homozygous recessive white pea plant 
D) heterozygous purple pea plant and homozygous dominant purple pea plant 
E) heterozygous purple pea plant and heterozygous purple pea plant

Question 18

The observable expression of the genes present.

Accepted Answer

A) genotype 
B) heterozygote 
C) homozygote 
D) phenotype 
A) genotype 
B) heterozygote 
C) homozygote 
D) phenotype

Question 19

In modern terminology,Mendel's factors are equivalent to _____.

Accepted Answer

A) DNA 
B) chromosomes 
C) genes 
D) RNA 
A) DNA 
B) chromosomes 
C) genes 
D) RNA

Question 20

Let P = purple flowers and p = white,and T = tall plants and t = dwarf.Of the 16 possible gamete combinations in the dihybrid cross,how many would be the phenotype white,tall?

Accepted Answer

A) none 
B) 1 
C) 3 
D) 9 
E) 16 
A) none 
B) 1 
C) 3 
D) 9 
E) 16

Exam 12: Patterns of Inheritance

Mendel's understanding of the inheritance of traits in peas,expressed in modern language,included all of the following except

If you crossed flies heterozygous for the Cy allele,what surviving genotypes would you find in the F2 generation?

Mendel's first law encompasses all of the following except

An allele that is present but unexpressed is

The ________ of an organism is the physical appearance resulting from the expression of the genes present.

Sometimes one gene pair will interact so as to control the expression of a second gene pair in an interaction called

A diploid individual carrying two different alleles on its homologous chromosomes.

A diploid organism that has two identical alleles for the same trait is called _______ for that particular trait.

When the two haploid gametes contain two different alleles of a given gene,the resulting offspring is called

As a genetic counselor,you are constructing a human pedigree for a particular disease.You note that every generation shows the trait,suggesting that it is

The observable outward manifestation of the genes of an individual is referred to as its

Let P = purple flowers and p = white,and T = tall plants and t = dwarf.What combinations of gametes could be produced by a heterozygote for both the traits?

An individual possessing both kinds of alleles of two different traits is called

The Principle of ________ states that alternative alleles for a trait segregate from one another during gamete formation and remain distinct.

A gene for a particular trait that is only expressed in the presence of another gene of the same kind is called a(n)

The phenotypic ratio for a testcross with a homozygous individual and a heterozygous individual is _______.

When Mendel crossed two purple-flowered pea plants with each other,he obtained a phenotypic ratio of 3:1 (purple-flowered pea plants to white-flowered pea plants).His results are consistent with which of the following sets of parents?

The observable expression of the genes present.

In modern terminology,Mendel's factors are equivalent to _____.

Let P = purple flowers and p = white,and T = tall plants and t = dwarf.Of the 16 possible gamete combinations in the dihybrid cross,how many would be the phenotype white,tall?

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If you crossed flies heterozygous for the Cy allele,what surviving genotypes would you find in the F₂ generation?