Alternate forms (the DNA sequences indicated by alphabetic abbreviations) of the same gene are called Select one:
a. traits.
b. chromatids.
c. chromosomes.
d. centromeres.
e. alleles.
e. alleles.
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The brains of female zebra finches lack the hormonal influences that occur in the brains of males
What changes are seen in the female brains as a result?
a. Auditory processing centers are especially well-developed in females. b. More neurons are produced in the higher vocal center. c. Transcription is boosted in genes whose products are involved in memory retention. d. The number of neurons in the higher vocal center declines. e. Octopamine levels increase, stimulating neural transmissions.
Which disease may be associated with low levels of body fat and low levels of estrogen?
A) diabetes B) stroke C) heart attack D) osteoporosis
What is the main reason that lung cancer develops?
A. There is exposure to allergens. B. The person's immune system is nonfunctional. C. Mitotic growth factors replicate. D. Two tumor suppressor genes undergo mutations.
Birds excrete their nitrogenous wastes in the form of
A) uric acid. B) ammonia. C) amine groups. D) urea. E) amino acids.