Question 1

If, in a heterozygous individual, only one allele is expressed in the phenotype, that allele is

Accepted Answer

A)   recessive.
B)   normal.
C)   haploid.
D)   dominant.
E)   potent.

Question 2

What are the possible gamete genotypes of an organism that has the genotype HhTt if the two genes are located on separate chromosomes and therefore not linked?

Accepted Answer

The answer of What are the possible gamete genotypes of...

Question 3

A man who carries a harmful sex- linked (on the X chromosome)  gene will pass the gene on to

Accepted Answer

A)   half of his sons.
B)   all of his sons.
C)   all of his daughters.
D)   half of his daughters.
E)   all of his sons and daughters.

Question 4

A human sperm cell possesses autosomes and

Accepted Answer

A)   a Y chromosome always.
B)   exactly the same genetic information as a body cell.
C)   either an X or a Y chromosome.
D)   both an X and a Y chromosome.
E)   an X chromosome always.

Question 5

In humans, the sex of the offspring is determined by the

Accepted Answer

A)   autosomes carried by the egg cell.
B)   sex chromosome carried by the sperm cell.
C)   autosomes carried by the sperm cell.
D)   cytoplasm carried by the egg cell.
E)   sex chromosome carried by the egg cell.

Question 6

Color deficiency is more common in men than in women because

Accepted Answer

A)   crossing over occurs only in women.
B)   men get more copies of the gene than do women.
C)   women cannot inherit the gene from their fathers.
D)   the gene is located on the Y chromosome.
E)   men have only one X chromosome.

Question 7

Imagine that you self- pollinate heterozygous purple- flowered, long- pollened pea plants and get mostly purple- flowered, long- pollened plants and white- flowered, short- pollened plants, with a few purple- flowered, short- pollened or white- flowered, long- pollened plants. What is the most likely explanation?

Accepted Answer

A)   Long pollen is often lethal, so few plants with long pollen survive to adulthood.
B)   This is a normal random variation from the expected ratio for independent assortment.
C)   The gene for flower color is on a sex chromosome.
D)   The genes for flower color and pollen length are linked.
E)   The purple allele influences pollen to become shorter.

Question 8

Which of the following is a sex- linked recessive condition?

Accepted Answer

A)   Cystic fibrosis
B)   Sickle- cell anemia
C)   Hemophilia
D)   Down syndrome
E)   Albinism

Question 9

Describe where in the process of meiosis independent assortment of genes occurs.

Accepted Answer

Homologous pairs of chromosome...

Question 10

In Mendel's experiments, if the gene for tall (T1)  plants was incompletely dominant over the gene for short (T2)  plants, what would be the result of crossing two T1T2 plants?

Accepted Answer

A)   50% tall, 25% intermediate, and 25% short
B)   25% tall, 25% intermediate, and 50% short
C)   All the offspring would be tall.
D)   25% tall, 50% intermediate, and 25% short
E)   All the offspring would be intermediate.

Question 11

What type of allele produces its effects in only homozygous individuals?

Accepted Answer

A)   Diploid
B)   Haploid
C)   Recessive
D)   Dominant

Question 12

For independent assortment of alleles for two different genes to occur, where must the genes be located?

Accepted Answer

The genes ...

Question 13

Suppose you cross a pea plant with yellow, smooth seeds with one that has green, wrinkled seeds. You examine the seeds of 967 offspring and find that some have yellow, smooth seeds and some have yellow, wrinkled seeds, but no green seeds of either type show up. What is the genotype of the yellow- seeded parent? (Y = yellow, y = green; S = smooth, s = wrinkled)

Accepted Answer

A)   YYss
B)   YYSs
C)   YySS
D)   YySs
E)   YYSS

Question 14

Which of the following is the most common chromosome disorder among live- born infants?

Accepted Answer

A)   Trisomy X
B)   Down syndrome
C)   Klinefelter syndrome
D)   Turner syndrome

Question 15

What is the difference between phenotype and genotype?

Accepted Answer

A)   Phenotype is the physical expression of a trait and genotype is the combination of alleles carried by the organism.
B)   Genotype is the physical expression of a trait and phenotype is the combination of alleles carried by the organism.
C)   Phenotype is when both alleles are the same and genotype is when the alleles are different.
D)   Phenotype is the alleles that are hidden and genotype is the alleles that are expressed.

Question 16

Sickle- cell anemia is caused by a

Accepted Answer

A)   combined interaction of several genes.
B)   recessive sex- linked gene.
C)   dominant autosomal gene.
D)   recessive autosomal gene.
E)   simple dominant gene.

Question 17

Codominance occurs when

Accepted Answer

A)   offspring exhibit several different phenotypic expressions of a single trait.
B)   a heterozygote expresses an intermediate phenotype.
C)   both of the alleles in a heterozygote are equally expressed phenotypically in an individual.
D)   expression of two different alleles alternates from one generation to the next.

Question 18

In garden peas, the allele for tall plants is dominant over the allele for short plants. Imagine that a true- breeding tall plant is crossed with a short plant. Then one of their offspring is test crossed. Out of 20 offspring resulting from the test cross, about how many should be tall?

Accepted Answer

A)   15
B)   0
C)   5
D)   20
E)   10

Question 19

Imagine you do a test cross between a purple- flowered pea plant having serrated leaves (both dominant traits)  and a white- flowered pea plant having smooth edges. If the purple- flowered plant is heterozygous for both traits, the expected ratio in the offspring is 1 purple- serrated:1 purple- smooth:1 white- serrated:1 white- smooth. Instead, you see 7 purple- serrated:1 purple- smooth:1 white- serrated:7 white- smooth. What is the explanation of this ratio?

Accepted Answer

A)   There has been a mutation during the cross.
B)   There is incomplete dominance.
C)   The genes are sex- linked and inherited by incomplete dominance.
D)   The genes are linked.

Question 20

What must occur to result in linked genes not being inherited together?

Accepted Answer

Chromosomes recombin...

Exam 11: Patterns of Inheritance

Correct Answer
verified

Correct Answer
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A man who carries a harmful sex- linked (on the X chromosome) gene will pass the gene on to

Correct Answer
verified

Which of the following is a sex- linked recessive condition?

Correct Answer
verified

What is the difference between phenotype and genotype?

Correct Answer
verified

What are the possible gamete genotypes of an organism that has the genotype HhTt if the two genes are located on separate chromosomes and therefore not linked?

Correct Answer
verified

Correct Answer
verified

Color deficiency is more common in men than in women because

Correct Answer
verified

What type of allele produces its effects in only homozygous individuals?

Correct Answer
verified

For independent assortment of alleles for two different genes to occur, where must the genes be located?

Correct Answer
verified
The genes ...
View Answer

In humans, the sex of the offspring is determined by the

Correct Answer
verified

A human sperm cell possesses autosomes and

Correct Answer
verified

Sickle- cell anemia is caused by a

Correct Answer
verified

What must occur to result in linked genes not being inherited together?

Correct Answer
verified
Chromosomes recombin...
View Answer

Which of the following is the most common chromosome disorder among live- born infants?

Correct Answer
verified

If, in a heterozygous individual, only one allele is expressed in the phenotype, that allele is

Correct Answer
verified

In garden peas, the allele for tall plants is dominant over the allele for short plants. Imagine that a true- breeding tall plant is crossed with a short plant. Then one of their offspring is test crossed. Out of 20 offspring resulting from the test cross, about how many should be tall?

Correct Answer
verified

In Mendel's experiments, if the gene for tall (T1) plants was incompletely dominant over the gene for short (T2) plants, what would be the result of crossing two T1T2 plants?

Correct Answer
verified

Codominance occurs when

Correct Answer
verified

Describe where in the process of meiosis independent assortment of genes occurs.

Correct Answer
verified
Homologous pairs of chromosome...
View Answer

Exam 11: Patterns of Inheritance

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A man who carries a harmful sex- linked (on the X chromosome) gene will pass the gene on to

Correct AnswerverifiedShow Answer

Which of the following is a sex- linked recessive condition?

Correct AnswerverifiedShow Answer

What is the difference between phenotype and genotype?

Correct AnswerverifiedShow Answer

What are the possible gamete genotypes of an organism that has the genotype HhTt if the two genes are located on separate chromosomes and therefore not linked?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Color deficiency is more common in men than in women because

Correct AnswerverifiedShow Answer

What type of allele produces its effects in only homozygous individuals?

Correct AnswerverifiedShow Answer

For independent assortment of alleles for two different genes to occur, where must the genes be located?

Correct AnswerverifiedThe genes ...View AnswerShow Answer

In humans, the sex of the offspring is determined by the

Correct AnswerverifiedShow Answer

A human sperm cell possesses autosomes and

Correct AnswerverifiedShow Answer

Sickle- cell anemia is caused by a

Correct AnswerverifiedShow Answer

What must occur to result in linked genes not being inherited together?

Correct AnswerverifiedChromosomes recombin...View AnswerShow Answer

Which of the following is the most common chromosome disorder among live- born infants?

Correct AnswerverifiedShow Answer

If, in a heterozygous individual, only one allele is expressed in the phenotype, that allele is

Correct AnswerverifiedShow Answer

In garden peas, the allele for tall plants is dominant over the allele for short plants. Imagine that a true- breeding tall plant is crossed with a short plant. Then one of their offspring is test crossed. Out of 20 offspring resulting from the test cross, about how many should be tall?

Correct AnswerverifiedShow Answer

In Mendel's experiments, if the gene for tall (T1) plants was incompletely dominant over the gene for short (T2) plants, what would be the result of crossing two T1T2 plants?

Correct AnswerverifiedShow Answer

Codominance occurs when

Correct AnswerverifiedShow Answer

Describe where in the process of meiosis independent assortment of genes occurs.

Correct AnswerverifiedHomologous pairs of chromosome...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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The genes ...
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Chromosomes recombin...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Homologous pairs of chromosome...
View Answer