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Question 1
Free
Short Answer

Please select the best match for each term.
A)When a genotype gives rise to a range of phenotypes
B)When each allele causes a distinct phenotype,and heterozygotes exhibit both phenotypes of heterozygotes
C)When heterozygotes display a phenotype intermediate between those shown by homozygotes for that allele
D)When a genotype underlies a given phenotype,but not all individuals with that genotype display the phenotype
E)When the genotype at one locus generates phenotypic expression of a trait that overrides and conceals the phenotypic traits arising from one or more other genes
-1)Codominance
2)Epistasis
3)Incomplete dominance
4)Incomplete penetrance
5)Variable expressivity

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Question 2
Free
Short Answer

Please select the best match for each term.
A)When a genotype causes a phenotype in only one sex
B)When either the frequency or amount of a phenotype depends on the sex of the individual
C)A phenotype caused by a maternal nuclear genotype that affects eggs prior to fertilization,and is therefore expressed in all offspring,regardless of paternal genes
D)When a cell or individual has more than one mitochondrial genome type
E)When a genotype and phenotype are only inherited from the mother
-6)Heteroplasmon
7)Maternal effect
8)Maternal inheritance
9)Sex-limited
10)Sex-influenced

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Question 3
Free
Multiple Choice

The distinctive fur pattern of Siamese cats results when genes that are responsible for the coat color are influenced by

Choose correct answer/s
A

age.

B

X-inactivation.

C

gender.

D

temperature.

E

other genes.

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Question 4
Free
Multiple Choice

A person with type B blood could safely receive a transfusion of blood from someone with blood type

Choose correct answer/s
A

B.

B

AB.

C

O.

D

Both A and C

E

Any of these

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Question 5
Free
Multiple Choice

Which of the following will result in modifications to the expected Mendelian ratios?

Choose correct answer/s
A

Epistasis

B

Incomplete dominance

C

Incomplete penetrance

D

Gene interaction

E

All of these

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Question 6
Multiple Choice

Two true-breeding mutant strains of Drosophila have black body color instead of the wild-type gray yellow.When the two strains are crossed,all the F1 flies have wild-type body color.How can these data be interpreted?

Choose correct answer/s
A
Recombination occurred.
B
Complementation occurred.
C
The mutations involved are on two different genes.
D
A new mutation occurred in all the offspring.
E
Both B and C
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Question 7
Multiple Choice

Manx cats have no tails.When two Manx cats are bred together there is always a one third chance that a kitten will have a tail.When a Manx cat is bred to a cat with a normal tail there is a one-half chance that a kitten will have a tail.Which of the following is the best explanation for this?

Choose correct answer/s
A
The Manx genotype exhibits variable expression.
B
The Manx phenotype is dominant,but the allele is a recessive lethal.
C
The Manx phenotype is dominant epistatic.
D
The Manx phenotype is caused by gene interactions.
E
The Manx phenotype is a result of heteroplasmy.
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Question 8
Multiple Choice

A and B antigens in human blood are produced by the conversion of ________ by the addition of a sugar group.

Choose correct answer/s
A
anti-A and anti-B antibodies
B
the H antigen
C
hemoglobin
D
α-N-acetylgalactosamine
E
anti-O antibodies
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Question 9
Multiple Choice

In the multiple allelic system for eye color in Drosophila,the phenotypic expression of the alleles depends on

Choose correct answer/s
A
how much pigment is produced by the alleles present.
B
the interaction of alleles from two different genes.
C
the temperature at which the flies are grown.
D
the sex of the fly.
E
Both A and B
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Question 10
Multiple Choice

Familial hypercholesterolemia is a genetic disease that affects approximately one in 500 people worldwide.There is more than one genetic cause of the disease.Class I is often described as an autosomal dominant disease.Affected individuals have cholesterol levels >250 as children and often >300 as adults.However,homozygotes have cholesterol levels of >600 as children and can die of heart attacks in their 20s.These individuals entirely lack a functional LDL receptor.Which of the following would be the best description of the inheritance of this form of hypercholesterolemia?

Choose correct answer/s
A
Dominant epistatic
B
Codominant
C
Incompletely dominant
D
Complementary
E
Recessive epistatic
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Question 11
Multiple Choice

People affected by diseases caused by mtDNA defects

Choose correct answer/s
A
typically have cells that are heteroplasmons.
B
show partial penetrance.
C
are sterile.
D
inherited them through maternal effect.
E
have epistatic respiration.
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Question 12
Multiple Choice

Two persons who have recessive genetic deafness marry and have 6 children.All the children can hear.The reason they can hear is most likely due to

Choose correct answer/s
A
epistasis.
B
pleiotropy.
C
sex linkage.
D
complementation.
E
partial penetrance.
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Question 13
Multiple Choice

Comb shape in chickens is controlled by

Choose correct answer/s
A
the interaction of three alleles and codominance,resulting in four different phenotypes.
B
one gene with incomplete dominance,resulting in three different phenotypes.
C
the epistatic interaction of two genes,resulting in two different phenotypes.
D
the interaction of two genes with complete dominance,resulting in four different phenotypes.
E
None of these
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Question 14
Multiple Choice

Individuals with neurofibromatosis may have a range of phenotypes,from pigment spots on the skin to tumorlike growths.This is an example of

Choose correct answer/s
A
incomplete penetrance.
B
variable expressivity.
C
age of onset.
D
X-inactivation.
E
gene magnification.
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Question 15
Multiple Choice

Solid black,black with tan belly,and agouti coat color in mice are all caused by alleles of the agouti gene.All three colors can be true-breeding.When using mice from true-breeding strains: (1)Black × Agouti F1s are all agouti,(2)Black × Black with Tan belly F1s are all black and tan,and (3)Black with Tan belly × Agouti F1s are all agouti.If you were to cross the F1s from (1)with the F1s from (2),what proportion of the resulting offspring would you expect to be black with a tan belly?

Choose correct answer/s
A
None
B
image
C
image
D
image
E
image
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Question 16
Multiple Choice

This form of inheritance is called

Choose correct answer/s
A
maternal inheritance.
B
sex-limited inheritance.
C
sex-linked inheritance.
D
maternal effect.
E
partial penetrance.
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Question 17
Multiple Choice

What were the genotypes of the sinistral female and dextral male that were initially chosen?

Choose correct answer/s
A
dd female and Dd male
B
Dd female and dd male
C
dd female and DD male
D
DD female and dd male
E
Dd female and Dd male
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Question 18
True/False

For a gene with complete dominance,the recessive allele has no effect on the phenotype of a heterozygote.

Choose correct answer/s
True
False
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Question 19
True/False

Studies performed on identical twins separated at birth have shown that many phenotypes,such as IQ or alcoholism,are influenced by the person's genotype as well as by their environment.

Choose correct answer/s
True
False
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Question 20
True/False

Mutants that make up a complementation group complement each other.

Choose correct answer/s
True
False
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