题目内容

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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Red–green color blindness is X-linked recessive. A woman with normal color vision has a father who is color blind. The woman has a child with a man with normal color vision. Which phenotype is NOT exp

A. a color-blind femal
B. a color-blind male
C. a noncolor-blind female
D. a noncolor-blind male

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In Drosophila, flies that are XXY but have a normal diploid set of autosomes have been found. Such XXY chromosome constitutions have also been found in humans. The sex of such individuals is expected

A. female in Drosophila but male in humans
B. male in both Drosophila and humans
C. female in both Drosophila and humans
D. male in Drosophila but female in humans
E. intersexes in Drosophila and males in humans

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In which of the following organisms is gender/sex determined by the temperature during embryonic development（）

A. many turtles and alligators
B. humans
C. mice
D. fruit flies
E. many snakes and birds

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Which of the following chromosome constitutions would never lead to a viable human baby being born（）

A. YY
B. XXX
C. XYY
D. XO （O = the absence of a second chromosome）
E. XXY

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