Question 1

The observation that individuals afflicted with albinism also always have vision problems is an example of

Accepted Answer

A) codominance. 
B) incomplete dominance. 
C) pleiotropy. 
D) epistasis. 
A) codominance. 
B) incomplete dominance. 
C) pleiotropy. 
D) epistasis. C

Question 2

The coat color in a Siamese cat is determined by a temperature-sensitive allele that allows the brownish pigment melanin to be produced in extremities of the body. What might explain this phenomenon?

Accepted Answer

A) Melanin appears darker in extremities because less light is reflected. 
B) Alleles are used to produce proteins that function best in specific temperature ranges. 
C) Siamese cats evolved in warm climates and did not need melanin. 
D) Extremities in a cat are more prone to damage from sunlight. 
A) Melanin appears darker in extremities because less light is reflected. 
B) Alleles are used to produce proteins that function best in specific temperature ranges. 
C) Siamese cats evolved in warm climates and did not need melanin. 
D) Extremities in a cat are more prone to damage from sunlight. B

Question 3

Consider a gene with two alleles that show complete dominance. When two heterozygotes for this gene breed, they have a 25 percent chance of producing a homozygous recessive offspring. The next time these two individuals breed, what are the chances that they will once again have a homozygous recessive progeny?

Accepted Answer

A) 0 percent 
B) 25 percent 
C) 50 percent 
D) 75 percent 
A) 0 percent 
B) 25 percent 
C) 50 percent 
D) 75 percent B

Question 4

Match each mode of inheritance to a statement listed below.
-The frizzle gene in chickens affects many traits, including feather type, metabolic rate, blood flow rates, and digestion.

Accepted Answer

A) incomplete dominance 
B) epistasis 
C) polygenic 
D) pleiotropy 
E) codominance
F)Mendelian trait 
A) incomplete dominance 
B) epistasis 
C) polygenic 
D) pleiotropy 
E) codominance
F)Mendelian trait

Question 5

What is the smallest number of traits that are needed to test Mendel's law of independent assortment?

Accepted Answer

A) one 
B) two 
C) four 
D) eight 
A) one 
B) two 
C) four 
D) eight

Question 6

Which of the following statements is true of Mendel's laws?

Accepted Answer

A) They are less accurate than Punnett square results. 
B) They are useful only in unusual situations. 
C) They correctly explain how genes are inherited. 
D) They correctly predict the phenotype of an organism. 
A) They are less accurate than Punnett square results. 
B) They are useful only in unusual situations. 
C) They correctly explain how genes are inherited. 
D) They correctly predict the phenotype of an organism.

Question 7

The figure shown illustrates

Accepted Answer

A) the law of independent assortment. 
B) the law of segregation. 
C) a dihybrid cross. 
D) a monohybrid cross. 
A) the law of independent assortment. 
B) the law of segregation. 
C) a dihybrid cross. 
D) a monohybrid cross.

Question 8

Most human genetic characters are

Accepted Answer

A) controlled by one gene. 
B) not inherited according to Mendel's laws. 
C) controlled by more than one gene. 
D) not heritable. 
A) controlled by one gene. 
B) not inherited according to Mendel's laws. 
C) controlled by more than one gene. 
D) not heritable.

Question 9

If two different alleles for the same trait have an equal effect on the phenotype, the alleles are

Accepted Answer

A) codominant. 
B) recessive. 
C) epistatic. 
D) incompletely dominant. 
A) codominant. 
B) recessive. 
C) epistatic. 
D) incompletely dominant.

Question 10

Why did Mendel analyze thousands of plants while conducting his research?

Accepted Answer

A) To allow him to control the environment of his pea plants. 
B) The likelihood of seeing a clear pattern is higher with a larger data set. 
C) Mendel knew that chromosomes undergo recombination during meiosis. 
D) To eliminate the probability of mutations affecting his data. 
A) To allow him to control the environment of his pea plants. 
B) The likelihood of seeing a clear pattern is higher with a larger data set. 
C) Mendel knew that chromosomes undergo recombination during meiosis. 
D) To eliminate the probability of mutations affecting his data.

Question 11

An allele is

Accepted Answer

A) a version of a gene. 
B) a trait that can be affected by the external environment. 
C) always codominant to its counterpart in another chromosome. 
D) the result of a change in phenotype. 
A) a version of a gene. 
B) a trait that can be affected by the external environment. 
C) always codominant to its counterpart in another chromosome. 
D) the result of a change in phenotype.

Question 12

________ dominance is expressed in a genetic cross in which the heterozygous phenotype is intermediate between the two homozygous phenotypes.

Accepted Answer

The answer of ________ dominance is expressed in a genetic...

Question 13

Mendel's laws of segregation and independent assortment both have their biological basis in events that take place during

Accepted Answer

A) chromosome formation. 
B) mutation. 
C) mitosis. 
D) meiosis. 
A) chromosome formation. 
B) mutation. 
C) mitosis. 
D) meiosis.

Question 14

According to Mendel's law of ________, when gametes are formed, the separation of alleles for one gene is unrelated to the separation of alleles for other genes.

Accepted Answer

independen

Question 15

Suppose D were dominant and d were recessive, and you could label the D allele in the P generation with a radioactive substance that could be inherited over several generations. You create hybrids by mating your radioactive DD individuals to dd individuals. Finally, you cross two F1 individuals (with the Dd genotype). In 1,000 offspring, how many would you predict would be radioactive?

Accepted Answer

A) 250 
B) 500 
C) 750 
D) 1,000 
A) 250 
B) 500 
C) 750 
D) 1,000

Question 16

Which of the following did Gregor Mendel notice in garden peas?

Accepted Answer

A) Some plants always produced offspring with flowers that were the same color as the parent plant's flowers. 
B) The first generation from a genetic cross of true-breeding plants always produced offspring that were intermediate in their phenotype and did not look like either parent. 
C) Garden peas always produce a variety of phenotypes in their offspring, which result from frequent mutations. 
D) Any individual pea plant carries at least three different alleles for flower color. 
A) Some plants always produced offspring with flowers that were the same color as the parent plant's flowers. 
B) The first generation from a genetic cross of true-breeding plants always produced offspring that were intermediate in their phenotype and did not look like either parent. 
C) Garden peas always produce a variety of phenotypes in their offspring, which result from frequent mutations. 
D) Any individual pea plant carries at least three different alleles for flower color.

Question 17

The individual who used data from breeding garden peas to discover the patterns of inheritance that form the foundation of modern-day genetics was ________.

Accepted Answer

Gregor Men

Question 18

The figure shown indicates two diseases with genetic links that are common in industrialized nations. The fact that both are about 80-90% avoidable indicates that

Accepted Answer

A) people are most likely avoiding having children with individuals who are affected by these diseases. 
B) these diseases are Mendelian traits that are expressed more frequently in industrialized nations where the average lifespan is longer. 
C) industrialized nations are able to use more resources to track these diseases in populations. 
D) these diseases are most likely affected by environmental factors in addition to genes. 
A) people are most likely avoiding having children with individuals who are affected by these diseases. 
B) these diseases are Mendelian traits that are expressed more frequently in industrialized nations where the average lifespan is longer. 
C) industrialized nations are able to use more resources to track these diseases in populations. 
D) these diseases are most likely affected by environmental factors in addition to genes.

Question 19

When Mendel proposed the law of segregation, which of the following pieces of information did he NOT have?

Accepted Answer

A) data on the outcomes of crossing two true-breeding pea plants 
B) ratios to predict the outcome of crossing two heterozygous pea plants 
C) a prediction for how a single trait is inherited 
D) knowledge of the location of the alleles for flower color 
A) data on the outcomes of crossing two true-breeding pea plants 
B) ratios to predict the outcome of crossing two heterozygous pea plants 
C) a prediction for how a single trait is inherited 
D) knowledge of the location of the alleles for flower color

Question 20

Which of the following statements is a basic summary of one of Mendel's laws?

Accepted Answer

A) All beneficial human genetic traits are dominant and harmful traits are recessive. 
B) The pattern of inherited characteristics of organisms is not predictable. 
C) The separation of alleles for one gene does not affect the separation of alleles for other genes. 
D) Recessive alleles cause the death of the gamete. 
A) All beneficial human genetic traits are dominant and harmful traits are recessive. 
B) The pattern of inherited characteristics of organisms is not predictable. 
C) The separation of alleles for one gene does not affect the separation of alleles for other genes. 
D) Recessive alleles cause the death of the gamete.

Exam 6: Patterns of Inheritance

The observation that individuals afflicted with albinism also always have vision problems is an example of

The coat color in a Siamese cat is determined by a temperature-sensitive allele that allows the brownish pigment melanin to be produced in extremities of the body. What might explain this phenomenon?

Match each mode of inheritance to a statement listed below. -The frizzle gene in chickens affects many traits, including feather type, metabolic rate, blood flow rates, and digestion.

What is the smallest number of traits that are needed to test Mendel's law of independent assortment?

Which of the following statements is true of Mendel's laws?

The figure shown illustrates

Most human genetic characters are

If two different alleles for the same trait have an equal effect on the phenotype, the alleles are

Why did Mendel analyze thousands of plants while conducting his research?

An allele is

________ dominance is expressed in a genetic cross in which the heterozygous phenotype is intermediate between the two homozygous phenotypes.

Mendel's laws of segregation and independent assortment both have their biological basis in events that take place during

According to Mendel's law of ________, when gametes are formed, the separation of alleles for one gene is unrelated to the separation of alleles for other genes.

Which of the following did Gregor Mendel notice in garden peas?

The individual who used data from breeding garden peas to discover the patterns of inheritance that form the foundation of modern-day genetics was ________.

The figure shown indicates two diseases with genetic links that are common in industrialized nations. The fact that both are about 80-90% avoidable indicates that

When Mendel proposed the law of segregation, which of the following pieces of information did he NOT have?

Which of the following statements is a basic summary of one of Mendel's laws?

The Nature of Science

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

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Adaptation and Species

The History of Life

Human Evolution

General Principles of Ecology

Growth of Populations

Communities of Organisms

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