Approximately what percent of the human genome encodes genetic information?
A. 1 D. 15
B. 3 E. 50
C. 5
C
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A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success. What would be the best followup experiment?
A. Inject testosterone and observe changes in spot count. B. Remove spots or add artificial spots to male tails and determine female responses. C. Measure the sperm count of males and compare to spot count. D. Count the number of spots on female tails and measure mating success.
In any experiment, changes to the dependent variable based on the manipulations of the independent variable are
measured. When determining the action spectrum of a given plant, what is the independent variable and what is the dependent variable?
a. independent = absorption of light; dependent = wavelength b. independent = wavelength; dependent = absorption of light c. independent = rate of O2 release in photosynthesis; dependent = absorption of light d. independent = wavelength; dependent = rate of O2 release in photosynthesis e. independent = rate of O2 release in photosynthesis; dependent = wavelength
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A lethal recessive allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?
A) 2:1 male to female B) 1:2 male to female C) 1:1 male to female D) 4:3 male to female E) 3:1 male to female
A form of mutation associated with the expansion in copy number of a nucleotide triplet in or near a gene is called a(n) ____________________
Fill in the blank(s) with correct word