Question 1

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

Question 2

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.

Question 3

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

Accepted Answer

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

Question 4

The observable expression of the genes present.

Accepted Answer

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

Question 5

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

Question 6

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.

Question 7

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.

Question 8

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.

Question 9

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.

Question 10

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

Question 11

An allele that is present but unexpressed is

Accepted Answer

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

Question 12

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.

Question 13

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

Question 14

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

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.

Question 16

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

Question 17

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

Question 18

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

Accepted Answer

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

Question 19

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.

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

Exam 12: Patterns of Inheritance

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Mendel's first law encompasses all of the following except

Correct AnswerverifiedShow Answer

The observable expression of the genes present.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

An allele that is present but unexpressed is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answer
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