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The himalayan allele in rabbits produces dark fur at the extremities of the body—on the nose, ears, and feet. The dark pigment develops, however, only when a rabbit is reared at a temperature of 25°C

A. temperature-sensitive allele
B. dominance
C. discontinuous characteristic
D. genetic imprinting
E. phenocopy

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Multifactorial traits are influenced by_and___（）

A. multiple genes; environment
B. dominance; codominance
C. epistasis; pleiotropy
D. age; sex
E. genetic imprinting; reduced penetrance

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Polydactyly is the condition of having extra fingers or toes. Some polydactylous persons possess extra fingers or toes that are fully functional, whereas others possess only a small tag of extra skin.

A. variable expressivity
B. complete dominance
C. independent assortment
D. complementation
E. cytoplasmic inheritance

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The bicoid mutation （bcd） in fruit flies is inherited as a maternal effect recessive allele. What is the expected ratio of phenotypes in the offspring of a cross between a heterozygous +/bcd female an

A. all normal
B. 1 normal : 1 mutant
C. 3 mutant : 1 normal
D. all mutant

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Achondroplasia is a common cause of dwarfism in humans. All individuals with achondroplasia are thought to be heterozygous at the locus that controls this trait. When two individuals with achondroplas

A. The allele that causes achondroplasia is a recessive lethal allele
B. Achondroplasia is incompletely dominant to the normal condition
C. Achondroplasia is codominant to the normal condition
D. The allele that causes achondroplasia is a dominant lethal allele
E. The allele that causes achondroplasia is a late-onset lethal allele

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The himalayan allele in rabbits produces dark fur at the extremities of the body—on the nose, ears, and feet. The dark pigment develops, however, only when a rabbit is reared at a temperature of 25°C

A. temperature-sensitive allele B. dominance C. discontinuous characteristic D. genetic imprinting E. phenocopy

Multifactorial traits are influenced by_and___（）

Polydactyly is the condition of having extra fingers or toes. Some polydactylous persons possess extra fingers or toes that are fully functional, whereas others possess only a small tag of extra skin.

The bicoid mutation （bcd） in fruit flies is inherited as a maternal effect recessive allele. What is the expected ratio of phenotypes in the offspring of a cross between a heterozygous +/bcd female an

Achondroplasia is a common cause of dwarfism in humans. All individuals with achondroplasia are thought to be heterozygous at the locus that controls this trait. When two individuals with achondroplas

A. temperature-sensitive allele
B. dominance
C. discontinuous characteristic
D. genetic imprinting
E. phenocopy