Question 1

In a monohybrid cross AA × aa, what proportion of heterozygotes is expected among the F2 offspring?

Accepted Answer

A) 1/4 
B) 1/2 
C) 3/4 
D) All are heterozygotes. 
E) None are heterozygotes. 
A) 1/4 
B) 1/2 
C) 3/4 
D) All are heterozygotes. 
E) None are heterozygotes.

Question 2

An allele that expresses its phenotype even when heterozygous with a recessive allele is termed

Accepted Answer

A) recessive. 
B) recombinant. 
C) dominant. 
D) parental. 
E) independent. 
A) recessive. 
B) recombinant. 
C) dominant. 
D) parental. 
E) independent.

Question 3

In corn, having ligules (L) is dominant to liguleless (l), and green leaves (G) is dominant to white leaves (g).
-If a testcross is performed with a dihybrid plant with ligules and green leaves, what proportion of the progeny would be green and liguleless?

Accepted Answer

A) 1/16 
B) 1/8 
C) 1/4 
D) 1/2 
E) Cannot be determined 
A) 1/16 
B) 1/8 
C) 1/4 
D) 1/2 
E) Cannot be determined

Question 4

If individuals 2 and 3 have a child together, what is the probability that the child will exhibit the disease?

Accepted Answer

A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) 100% 
A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) 100%

Question 5

How was the approach taken by Mendel similar to the approaches taken by modern scientific inquiry?

Accepted Answer

A) Mendel repeated his experiments. 
B) Mendel examined both continuous and discrete traits. 
C) Mendel used the same technical methods that are used today. 
D) Mendel's experiments challenged no hypotheses that were favored at the time. 
A) Mendel repeated his experiments. 
B) Mendel examined both continuous and discrete traits. 
C) Mendel used the same technical methods that are used today. 
D) Mendel's experiments challenged no hypotheses that were favored at the time.

Question 6

What does the pattern of inheritance in this pedigree indicate about the disease allele?

Accepted Answer

A) The disease allele is recessive. 
B) The disease allele is dominant. 
C) There is no indication that the disease allele is either dominant or recessive. 
D) The disease allele is not inherited but arises only by a new mutation in affected individuals. 
A) The disease allele is recessive. 
B) The disease allele is dominant. 
C) There is no indication that the disease allele is either dominant or recessive. 
D) The disease allele is not inherited but arises only by a new mutation in affected individuals.

Question 7

An alternative form of a single gene is known as

Accepted Answer

A) a parental. 
B) a dihybrid. 
C) a reciprocal. 
D) an allele. 
E) a recessive. 
A) a parental. 
B) a dihybrid. 
C) a reciprocal. 
D) an allele. 
E) a recessive.

Question 8

Pea shape is controlled by a gene that specifies an enzyme known as Sbe1 (for Starch-branching enzyme 1).A recessive allele of Sbe1 likely encodes

Accepted Answer

A) an Sbe1 enzyme with reduced function. 
B) an Sbe1 enzyme with a new function. 
C) a different type of enzyme. 
D) an Sbe1 enzyme with enhanced catalytic activity. 
A) an Sbe1 enzyme with reduced function. 
B) an Sbe1 enzyme with a new function. 
C) a different type of enzyme. 
D) an Sbe1 enzyme with enhanced catalytic activity.

Question 9

Among the dihybrid crosses below, which will produce a 1:1 phenotypic ratio?

Accepted Answer

A) AA BB × aa bb 
B) Aa Bb × Aa Bb 
C) Aa Bb × aa bb 
D) Aa BB × aa BB 
E) AA bb × aa BB 
A) AA BB × aa bb 
B) Aa Bb × Aa Bb 
C) Aa Bb × aa bb 
D) Aa BB × aa BB 
E) AA bb × aa BB

Question 10

Below is a pedigree of a human genetic disease in which solid color indicates affected individuals.Assume that the disease is caused by a gene that can have the alleles A or a.  
-What is/are the possible genotype(s)of person 4?

Accepted Answer

A) AA 
B) Aa 
C) Either AA or Aa 
D) aa 
E) Cannot be determined 
A) AA 
B) Aa 
C) Either AA or Aa 
D) aa 
E) Cannot be determined

Question 11

Below is a pedigree for a common human trait (not a disease)controlled by a single gene.Shaded symbols are for individuals exhibiting the trait.  
-Identify the mode of inheritance of the trait.

Accepted Answer

A) Dominant 
B) Recessive 
C) Either dominant or recessive 
D) Cannot be determined 
A) Dominant 
B) Recessive 
C) Either dominant or recessive 
D) Cannot be determined

Question 12

Among the dihybrid crosses below, which will produce offspring with a 1:1:1:1 genotypic ratio?

Accepted Answer

A) AA BB × aa bb 
B) Aa Bb × Aa Bb 
C) Aa Bb × aa bb 
D) Aa BB × aa BB 
E) AA bb × aa BB 
A) AA BB × aa bb 
B) Aa Bb × Aa Bb 
C) Aa Bb × aa bb 
D) Aa BB × aa BB 
E) AA bb × aa BB

Question 13

The diploid cell formed by the fertilization of the egg by the sperm during sexual reproduction is a

Accepted Answer

A) reciprocal. 
B) zygote. 
C) dihybrid. 
D) gamete. 
E) monohybrid. 
A) reciprocal. 
B) zygote. 
C) dihybrid. 
D) gamete. 
E) monohybrid.

Question 14

For each of the following pedigree symbols, select the correct meaning.
-

Accepted Answer

A) Unaffected male 
B) Unaffected female 
C) Mating 
D) Affected male 
E) Affected female 
A) Unaffected male 
B) Unaffected female 
C) Mating 
D) Affected male 
E) Affected female

Question 15

In the dihybrid cross Aa Bb × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F1 offspring?

Accepted Answer

A) 1/4 
B) 1/2 
C) 3/4 
D) All are heterozygotes. 
E) None are heterozygotes. 
A) 1/4 
B) 1/2 
C) 3/4 
D) All are heterozygotes. 
E) None are heterozygotes.

In a monohybrid cross AA × aa, what proportion of heterozygotes is expected among the F₂ offspring?

An allele that expresses its phenotype even when heterozygous with a recessive allele is termed

In corn, having ligules (L) is dominant to liguleless (l), and green leaves (G) is dominant to white leaves (g). -If a testcross is performed with a dihybrid plant with ligules and green leaves, what proportion of the progeny would be green and liguleless?

If individuals 2 and 3 have a child together, what is the probability that the child will exhibit the disease?

How was the approach taken by Mendel similar to the approaches taken by modern scientific inquiry?

What does the pattern of inheritance in this pedigree indicate about the disease allele?

An alternative form of a single gene is known as

Pea shape is controlled by a gene that specifies an enzyme known as Sbe1 (for Starch-branching enzyme 1).A recessive allele of Sbe1 likely encodes

Among the dihybrid crosses below, which will produce a 1:1 phenotypic ratio?

Below is a pedigree of a human genetic disease in which solid color indicates affected individuals.Assume that the disease is caused by a gene that can have the alleles A or a. -What is/are the possible genotype(s)of person 4?

Below is a pedigree for a common human trait (not a disease)controlled by a single gene.Shaded symbols are for individuals exhibiting the trait. -Identify the mode of inheritance of the trait.

Among the dihybrid crosses below, which will produce offspring with a 1:1:1:1 genotypic ratio?

The diploid cell formed by the fertilization of the egg by the sperm during sexual reproduction is a

For each of the following pedigree symbols, select the correct meaning. -

In the dihybrid cross Aa Bb × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F₁ offspring?

Genetics: the Study of Biological Information

Extensions to Mendels Laws

The Chromosome Theory of Inheritance

Linkage, Recombination, and the Mapping of Genes on Chromosomes

DNA Structure, Replication, and Recombination

Anatomy and Function of a Gene: Dissection Through Mutation

Gene Expression: the Flow of Information From Dna to Rna to Protein

Digital Analysis of Dna

Genome Annotation

Analyzing Genomic Variation

The Eukaryotic Chromosome

Chromosomal Rearrangements and Changes in Chromosome Number

Bacterial Genetics

Organellar Inheritance

Gene Regulation in Prokaryotes

Gene Regulation in Eukaryotes

Manipulating the Genomes of Eukaryotes

The Genetic Analysis of Development

The Genetics of Cancer

Variation and Selection in Populations

The Genetics of Complex Traits

Filters

Exam 2: Mendels Principles of Heredity

In a monohybrid cross AA × aa, what proportion of heterozygotes is expected among the F2 offspring?

An allele that expresses its phenotype even when heterozygous with a recessive allele is termed

In corn, having ligules (L) is dominant to liguleless (l), and green leaves (G) is dominant to white leaves (g). -If a testcross is performed with a dihybrid plant with ligules and green leaves, what proportion of the progeny would be green and liguleless?

If individuals 2 and 3 have a child together, what is the probability that the child will exhibit the disease?

How was the approach taken by Mendel similar to the approaches taken by modern scientific inquiry?

What does the pattern of inheritance in this pedigree indicate about the disease allele?

An alternative form of a single gene is known as

Pea shape is controlled by a gene that specifies an enzyme known as Sbe1 (for Starch-branching enzyme 1).A recessive allele of Sbe1 likely encodes

Among the dihybrid crosses below, which will produce a 1:1 phenotypic ratio?

Below is a pedigree of a human genetic disease in which solid color indicates affected individuals.Assume that the disease is caused by a gene that can have the alleles A or a. -What is/are the possible genotype(s)of person 4?

Below is a pedigree for a common human trait (not a disease)controlled by a single gene.Shaded symbols are for individuals exhibiting the trait. -Identify the mode of inheritance of the trait.

Among the dihybrid crosses below, which will produce offspring with a 1:1:1:1 genotypic ratio?

The diploid cell formed by the fertilization of the egg by the sperm during sexual reproduction is a

For each of the following pedigree symbols, select the correct meaning. -

In the dihybrid cross Aa Bb × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F1 offspring?

Genetics: the Study of Biological Information

Extensions to Mendels Laws

The Chromosome Theory of Inheritance

Linkage, Recombination, and the Mapping of Genes on Chromosomes

DNA Structure, Replication, and Recombination

Anatomy and Function of a Gene: Dissection Through Mutation

Gene Expression: the Flow of Information From Dna to Rna to Protein

Digital Analysis of Dna

Genome Annotation

Analyzing Genomic Variation

The Eukaryotic Chromosome

Chromosomal Rearrangements and Changes in Chromosome Number

Bacterial Genetics

Organellar Inheritance

Gene Regulation in Prokaryotes

Gene Regulation in Eukaryotes

Manipulating the Genomes of Eukaryotes

The Genetic Analysis of Development

The Genetics of Cancer

Variation and Selection in Populations

The Genetics of Complex Traits

Filters

In a monohybrid cross AA × aa, what proportion of heterozygotes is expected among the F₂ offspring?

In the dihybrid cross Aa Bb × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F₁ offspring?