Question 1

What are the odds of tossing a coin and having it come up heads three times in a row?

Accepted Answer

A)   1/3 1/3 1/3
B)   25 percent
C)   50 percent
D)   1/2 1/2 1/2
E)   1/2 1/3 1/4

Question 2

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. If a YyPp plant is crossed to a Yypp plant, what is the probability that the resulting plant will have the genotype Yypp? (Hint: Determine two separate probabilities, and use the rule of multiplication.)

Accepted Answer

A)   1/2
B)   1/8
C)   1/32
D)   1/16
E)   1/4 E

Question 3

Match Mendel's results in column 1 with the conclusion he drew from them in column 2.
-When two traits are followed in a dihybrid cross, heterozygotes give offspring with all combinations of phenotypes, in a 9:3:3:1 ratio.

Accepted Answer

A)   There is no "blending" in inheritance.
B)   Alleles come in dominant and recessive forms.
C)   Genes assort independently in gamete formation.
D)   Organisms have two alleles of each gene (elements) , and only one is passed to offspring.

Question 4

Refer to the figure above and then answer the question that follows.
-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 5

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 6

Why do you think Mendel cross-fertilized plants in the P generation, but self-fertilized in the F1 generation?

Accepted Answer

He cross-fertilized the P plants because they were already true-breeding and presumably uniform in their genotype (homozygous). Crossing them allowed him to see the results of mixing the two genotype backgrounds. He self-fertilized the F₁ in order to determine the genetic background (genotype) of each F₁ individual.

Question 7

Researchers involved in the Human Genome Project are working to determine the genetic causes of many diseases. In some cases, an allele has been identified that is associated with the particular disease, and a test for that allele can be performed. If a person tests positive for that allele, it does not always mean that they will develop the disease. Explain what else might be a factor in whether the person actually develops the disease.

Accepted Answer

Environmen...

Question 8

Alleles that are dominant are:

Accepted Answer

A)   more common than recessive alleles.
B)   generally more evolutionarily advantageous than recessive alleles.
C)   capable of hiding or masking a recessive allele.

Question 9

In the individual with genotype AaBB, what percentage of gametes will contain the A allele?

Accepted Answer

A)   75 percent
B)   25 percent
C)   100 percent
D)   10 percent
E)   50 percent

Question 10

Match Mendel's results in column 1 with the conclusion he drew from them in column 2.
-When true-breeding P plants are crossed, all offspring had the trait of one of the parents.

Accepted Answer

A)   There is no "blending" in inheritance.
B)   Alleles come in dominant and recessive forms.
C)   Genes assort independently in gamete formation.
D)   Organisms have two alleles of each gene (elements) , and only one is passed to offspring.

Question 11

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 12

Which type of allele, or allelic combination, can be present in an individual without affecting phenotype?

Accepted Answer

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

Question 13

Which of the following did Gregor Mendel not illustrate?

Accepted Answer

A)   Identical phenotypes do not necessarily mean organisms have identical genotypes.
B)   Units of inheritance come in pairs.
C)   Phenotypic characteristics do not "blend" over many generations.
D)   Inheritance is caused by discrete particles.
E)   Units of inheritance are found on chromosomes.

Question 14

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 plant of unknown genotype with yellow seeds and purple flowers is crossed to a plant with green seeds and white flowers. The offspring all have yellow seeds, but some have purple flowers and some have white flowers. What is the genotype of the yellow-seeded, purple-flowered plant?

Accepted Answer

A)   YyPp
B)   YYPp
C)   YyPP
D)   YYPP
E)   Yypp

Question 15

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. If a plant that is heterozygous for both flower color and seed color genes is self-fertilized, what proportion of the offspring will have one of the dominant phenotypes, either the seed color or flower color, but not both?

Accepted Answer

A)   6/64
B)   6/32
C)   6/16
D)   9/32
E)   9/16

Question 16

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; half of the offspring would be red or white.
D)   Yes; there is always a wide range of phenotypes in monohybrid crosses.

Question 17

What is considered a "black box in biology?

Accepted Answer

A)   various cellular organelles
B)   any of a number of expensive automated scientific machines
C)   processes in which we know only input and output
D)   patented devices whose mechanisms are known only by the manufacturer
E)   an old camera C

Question 18

The one gene, one phenotype model:

Accepted Answer

A)   is well supported by available evidence.
B)   is usually the relationship in inheritance.
C)   is not a good model because aspects of phenotypes are often controlled by many genes.

Question 19

In humans, "unattached earlobes are dominant over "attached earlobes. A woman and a man, both with unattached earlobes, have a child with attached earlobes. What is the probability their next child will have attached earlobes?

Accepted Answer

A)   3/4
B)   1/4
C)   2/4
D)   4/4
E)   0

Question 20

If one in 10 people carries the IA allele, and one in 20 people carries the IB allele, what is the probability that one person will have the IA IB genotype?

Accepted Answer

A)   1/30
B)   1/2
C)   1/200
D)   1/10
E)   2/30

Exam 11: Mendel and His Discoveries

What are the odds of tossing a coin and having it come up heads three times in a row?

Correct Answer
verified

Correct Answer
verified
E

Match Mendel's results in column 1 with the conclusion he drew from them in column 2. -When two traits are followed in a dihybrid cross, heterozygotes give offspring with all combinations of phenotypes, in a 9:3:3:1 ratio.

Correct Answer
verified

Refer to the figure above and then answer the question that follows. -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

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

Why do you think Mendel cross-fertilized plants in the P generation, but self-fertilized in the F₁ generation?

Correct Answer
verified
Environmen...
View Answer

Alleles that are dominant are:

Correct Answer
verified

In the individual with genotype AaBB, what percentage of gametes will contain the A allele?

Correct Answer
verified

Match Mendel's results in column 1 with the conclusion he drew from them in column 2. -When true-breeding P plants are crossed, all offspring had the trait of one of the parents.

Correct Answer
verified

Correct Answer
verified

Which type of allele, or allelic combination, can be present in an individual without affecting phenotype?

Correct Answer
verified

Which of the following did Gregor Mendel not illustrate?

Correct Answer
verified

Correct Answer
verified

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

What is considered a "black box in biology?

Correct Answer
verified
C

The one gene, one phenotype model:

Correct Answer
verified

In humans, "unattached earlobes are dominant over "attached earlobes. A woman and a man, both with unattached earlobes, have a child with attached earlobes. What is the probability their next child will have attached earlobes?

Correct Answer
verified

If one in 10 people carries the I^A allele, and one in 20 people carries the I^B allele, what is the probability that one person will have the I^A I^B genotype?

Correct Answer
verified

Exam 11: Mendel and His Discoveries

What are the odds of tossing a coin and having it come up heads three times in a row?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedE

Match Mendel's results in column 1 with the conclusion he drew from them in column 2. -When two traits are followed in a dihybrid cross, heterozygotes give offspring with all combinations of phenotypes, in a 9:3:3:1 ratio.

Correct AnswerverifiedShow Answer

Refer to the figure above and then answer the question that follows. -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

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

Why do you think Mendel cross-fertilized plants in the P generation, but self-fertilized in the F1 generation?

Correct AnswerverifiedEnvironmen...View AnswerShow Answer

Alleles that are dominant are:

Correct AnswerverifiedShow Answer

In the individual with genotype AaBB, what percentage of gametes will contain the A allele?

Correct AnswerverifiedShow Answer

Match Mendel's results in column 1 with the conclusion he drew from them in column 2. -When true-breeding P plants are crossed, all offspring had the trait of one of the parents.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which type of allele, or allelic combination, can be present in an individual without affecting phenotype?

Correct AnswerverifiedShow Answer

Which of the following did Gregor Mendel not illustrate?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

What is considered a "black box in biology?

Correct AnswerverifiedC

The one gene, one phenotype model:

Correct AnswerverifiedShow Answer

In humans, "unattached earlobes are dominant over "attached earlobes. A woman and a man, both with unattached earlobes, have a child with attached earlobes. What is the probability their next child will have attached earlobes?

Correct AnswerverifiedShow Answer

If one in 10 people carries the IA allele, and one in 20 people carries the IB allele, what is the probability that one person will have the IA IB genotype?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Why do you think Mendel cross-fertilized plants in the P generation, but self-fertilized in the F₁ generation?

Correct Answer
verified
Environmen...
View Answer

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
C

Correct Answer
verified

Correct Answer
verified

If one in 10 people carries the I^A allele, and one in 20 people carries the I^B allele, what is the probability that one person will have the I^A I^B genotype?

Correct Answer
verified