Question 1

A man with type O blood has a sister with type AB blood. What are the genotypes and phenotypes of their parents?

Accepted Answer

One of the parents is heterozy...

Question 2

When Mendel crossed heterozygotes for flower color and seed color, what proportion of the offspring had both dominant phenotypes?

Accepted Answer

A)   3/4
B)   3/16
C)   1/3
D)   1/16
E)   9/16

Question 3

The physical characteristics of an organism, or its ________, are determined by its genetic makeup, referred to as its ________.

Accepted Answer

The answer of The physical characteristics of an organism, or...

Question 4

What is the basis of codominance?

Accepted Answer

A)   There is only one allele for a gene.
B)   One allele of a gene encodes a protein, and the other allele is nonfunctional.
C)   One gene has many alleles.
D)   Each allele of a gene produces a protein that functions to create a trait.
E)   One allele can have many effects on a phenotype.

Question 5

Before Mendel, people had observed inheritance of dominant and recessive traits by following many generations of plants and animals. What was different about Mendel's work?

Accepted Answer

A)   He used a plant that had never been cultivated before.
B)   He kept careful count of his results, including mathematical analysis.
C)   His results were immediately accepted and applied to other studies.
D)   He followed more generations than anyone else.
E)   He did both cross- and self-fertilizations.

Question 6

If an individual exhibits a recessive trait, which of the following statements can you be sure of?

Accepted Answer

A)   The phenotype for this trait is different from the phenotype of the homozygous dominant genotype for this trait.
B)   The genotype of this trait will be heterozygous.
C)   Both parents of this individual had the same genotype for this trait.
D)   Any siblings of this individual will have the same phenotype for this trait.
E)   Any children this individual has will always exhibit the trait, regardless of the genotype of the other parent.

Question 7

When Mendel performed a dihybrid cross of plants heterozygous for seed color and seed shape, he saw a 9:3:3:1 ratio in the next generation. Explain what this ratio describes and what each number represents.

Accepted Answer

It is the ratio of offspring with the fo...

Question 8

If all of Mendel's monohybrid crosses had involved traits that function by incomplete dominance, would his results have supported blending inheritance?

Accepted Answer

A)   It cannot be determined with the information given.
B)   Yes; a cross between red and white flowers would yield all pink offspring.
C)   No; he would still have seen the dominant and recessive traits reappear in the F2 generation.
D)   Yes; there is always a wide range of phenotypes in monohybrid crosses.

Question 9

Which of the following represents a dihybrid cross?

Accepted Answer

A)   YYyy x PPpp
B)   YY x pp
C)   YyPp x YyPp
D)   YP x Yp
E)   Yp x YY

Question 10

The D gene controls pea plant height. The DD and dd genotypes confer tall and dwarf phenotypes, respectively. What is the relationship between D and d?

Accepted Answer

A)   They are two different plant chromosomes.
B)   They are two different genes on the same chromosome.
C)   They are alleles of the same gene.
D)   They are two possible homozygous genotypes.
E)   They are two possible heterozygous genotypes.

Question 11

In order to track the inheritance of two characters, you would need to do a:

Accepted Answer

A)   monohybrid cross.
B)   dihybrid cross.
C)   trihybrid cross.
D)   true-breeding cross.

Question 12

In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. A true-breeding plant with green seeds and white flowers is crossed to a plant that is heterozygous for the genes for both phenotypes. What is the probability that the cross will yield a plant with green seeds and white flowers?

Accepted Answer

A)   3/16
B)   3/32
C)   1/32
D)   1/16
E)   1/4

Question 13

Cystic fibrosis (CF)  is caused by a recessive allele. A child has CF, even though neither of his parents has CF. Which of the following describes the genotypes of the parents?

Accepted Answer

A)   One is homozygous dominant for the CF gene, and the other is heterozygous.
B)   One is homozygous recessive for the CF gene, and the other is heterozygous.
C)   They are both homozygous recessive for the CF gene.
D)   They are both homozygous dominant for the CF gene.
E)   They are both heterozygous for the CF gene.

Question 14

In humans, "unattached" earlobes are dominant over "attached" earlobes. Widow's-peak hairline is dominant over non-widow's-peak hairline. Use E and e for the earlobe phenotype alleles and W and w for the hairline phenotype alleles. A woman and a man, both with genotype EeWw, have a child. What is the probability that the child will have attached earlobes and a widow's peak?

Accepted Answer

A)   1/16
B)   9/16
C)   1/3
D)   3/4
E)   3/16

Question 15

Mendel postulated that individuals have genetic elements that exist in pairs, which determine a single phenotype. What do we now know these pairs of elements to be?

Accepted Answer

A)   two haploid sets of chromosomes
B)   two alleles of a gene on homologous chromosomes
C)   pairs of sister chromatids
D)   pairs of centromeres
E)   a sperm and an egg

Question 16

In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. What is the relationship between the Y and P?

Accepted Answer

A)   They are two different genes on two different chromosomes.
B)   They are two different genes on the same chromosome.
C)   They are two different chromosomes in the pea plant.
D)   They are the pleiotropic effects of a single gene.
E)   They are incompletely dominant alleles of the same gene.

Question 17

What is the difference between a monohybrid and a dihybrid cross?

Accepted Answer

A monohybrid cross f...

Question 18

A, B, and O blood type in humans is controlled by a single gene with three alleles: IA, IB, and i. Type O is the recessive trait. The i allele is recessive to both IA and IB. Which of the following could be possible genotypes of the parents of a person with type O blood?

Accepted Answer

A)   IAIB and ii
B)   IAi and IAIA
C)   IAi and IBi
D)   IAIB and IAIB

Question 19

Mendel's contribution to genetics was the discovery of DNA.

Accepted Answer

A) True 
 B)False

Question 20

The genotype Ff is an example of a:

Accepted Answer

A)   trait controlled by multiple genes.
B)   homozygous genotype.
C)   monohybrid genotype.
D)   heterozygous genotype.
E)   dihybrid genotype.

Exam 11: The First Geneticist: Mendel and His Discoveries

Correct Answer
verified

The D gene controls pea plant height. The DD and dd genotypes confer tall and dwarf phenotypes, respectively. What is the relationship between D and d?

Correct Answer
verified

In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. What is the relationship between the Y and P?

Correct Answer
verified

Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. Which of the following describes the genotypes of the parents?

Correct Answer
verified

When Mendel crossed heterozygotes for flower color and seed color, what proportion of the offspring had both dominant phenotypes?

Correct Answer
verified

Correct Answer
verified

In order to track the inheritance of two characters, you would need to do a:

Correct Answer
verified

What is the difference between a monohybrid and a dihybrid cross?

Correct Answer
verified
A monohybrid cross f...
View Answer

When Mendel performed a dihybrid cross of plants heterozygous for seed color and seed shape, he saw a 9:3:3:1 ratio in the next generation. Explain what this ratio describes and what each number represents.

Correct Answer
verified
It is the ratio of offspring with the fo...
View Answer

The genotype Ff is an example of a:

Correct Answer
verified

Mendel postulated that individuals have genetic elements that exist in pairs, which determine a single phenotype. What do we now know these pairs of elements to be?

Correct Answer
verified

Before Mendel, people had observed inheritance of dominant and recessive traits by following many generations of plants and animals. What was different about Mendel's work?

Correct Answer
verified

What is the basis of codominance?

Correct Answer
verified

The physical characteristics of an organism, or its , are determined by its genetic makeup, referred to as its .

Correct Answer
verified

If an individual exhibits a recessive trait, which of the following statements can you be sure of?

Correct Answer
verified

If all of Mendel's monohybrid crosses had involved traits that function by incomplete dominance, would his results have supported blending inheritance?

Correct Answer
verified

Which of the following represents a dihybrid cross?

Correct Answer
verified

A, B, and O blood type in humans is controlled by a single gene with three alleles: I^A, I^B, and i. Type O is the recessive trait. The i allele is recessive to both I^A and I^B. Which of the following could be possible genotypes of the parents of a person with type O blood?

Correct Answer
verified

Mendel's contribution to genetics was the discovery of DNA.

Correct Answer
verified

A man with type O blood has a sister with type AB blood. What are the genotypes and phenotypes of their parents?

Correct Answer
verified
One of the parents is heterozy...
View Answer

Exam 11: The First Geneticist: Mendel and His Discoveries

Correct AnswerverifiedShow Answer

The D gene controls pea plant height. The DD and dd genotypes confer tall and dwarf phenotypes, respectively. What is the relationship between D and d?

Correct AnswerverifiedShow Answer

In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. What is the relationship between the Y and P?

Correct AnswerverifiedShow Answer

Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. Which of the following describes the genotypes of the parents?

Correct AnswerverifiedShow Answer

When Mendel crossed heterozygotes for flower color and seed color, what proportion of the offspring had both dominant phenotypes?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In order to track the inheritance of two characters, you would need to do a:

Correct AnswerverifiedShow Answer

What is the difference between a monohybrid and a dihybrid cross?

Correct AnswerverifiedA monohybrid cross f...View AnswerShow Answer

When Mendel performed a dihybrid cross of plants heterozygous for seed color and seed shape, he saw a 9:3:3:1 ratio in the next generation. Explain what this ratio describes and what each number represents.

Correct AnswerverifiedIt is the ratio of offspring with the fo...View AnswerShow Answer

The genotype Ff is an example of a:

Correct AnswerverifiedShow Answer

Mendel postulated that individuals have genetic elements that exist in pairs, which determine a single phenotype. What do we now know these pairs of elements to be?

Correct AnswerverifiedShow Answer

Before Mendel, people had observed inheritance of dominant and recessive traits by following many generations of plants and animals. What was different about Mendel's work?

Correct AnswerverifiedShow Answer

What is the basis of codominance?

Correct AnswerverifiedShow Answer

The physical characteristics of an organism, or its ________, are determined by its genetic makeup, referred to as its ________.

Correct AnswerverifiedShow Answer

If an individual exhibits a recessive trait, which of the following statements can you be sure of?

Correct AnswerverifiedShow Answer

If all of Mendel's monohybrid crosses had involved traits that function by incomplete dominance, would his results have supported blending inheritance?

Correct AnswerverifiedShow Answer

Which of the following represents a dihybrid cross?

Correct AnswerverifiedShow Answer

A, B, and O blood type in humans is controlled by a single gene with three alleles: IA, IB, and i. Type O is the recessive trait. The i allele is recessive to both IA and IB. Which of the following could be possible genotypes of the parents of a person with type O blood?

Correct AnswerverifiedShow Answer

Mendel's contribution to genetics was the discovery of DNA.

Correct AnswerverifiedShow Answer

A man with type O blood has a sister with type AB blood. What are the genotypes and phenotypes of their parents?

Correct AnswerverifiedOne of the parents is heterozy...View AnswerShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A monohybrid cross f...
View Answer

Correct Answer
verified
It is the ratio of offspring with the fo...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The physical characteristics of an organism, or its , are determined by its genetic makeup, referred to as its .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A, B, and O blood type in humans is controlled by a single gene with three alleles: I^A, I^B, and i. Type O is the recessive trait. The i allele is recessive to both I^A and I^B. Which of the following could be possible genotypes of the parents of a person with type O blood?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
One of the parents is heterozy...
View Answer