The mutation responsible for Huntington's disease is a
A. triplet repeat expansion mutation.
B. nonsense mutation.
C. missense mutation.
D. frameshift mutation.
Answer: A
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The process of song learning by white-crowned sparrows is similar to the process of territory-holding by African
cichlid fishes because brain cells in both animals can change ____ in response to well-defined social stimuli.
a. only their biochemistry b. only their structure c. only their function d. only their structure and function e. their biochemistry, structure, and function
Males with one copy of an X-linked gene are said to be ________ for that gene.
A) homozygous B) heteroallelic C) heterozygous D) hemizygous E) deficient
In peas, the round allele is dominant over the wrinkled allele. A plant with round peas was crossed to a plant with wrinkled peas and all of the resulting plants had round peas. What is the genotype of the parents in this cross?
A) RR × rr B) RR × Rr C) Rr × rr D) Rr × Rr E) rr × rr
What is the relative biological fitness of an individual who is heterozygous for sickle-cell disease who lives in central Illinois vs. an individual who is heterozygous and lives in South Africa?
What will be an ideal response?