A population that is in genetic equilibrium is said to ____
a. have an equal number of homozygotes as heterozygotes for a given trait
b. deviate from the Hardy-Weinberg law
c. require genetic testing for estimation of allele frequencies
d. lose genetic variation with each generation
e. have an allele or alleles that remain constant generation to generation
e
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Which of the following scenarios would provide the most relevant data on population density?
A) Count the number of nests of a particular species of songbird and multiply this by a factor that extrapolates these data to actual animals. B) Count the number of pine trees in several randomly selected 10-meter-square plots and extrapolate this number to the fraction of the study area these plots represent. C) Use the mark-recapture method to estimate the size of the population. D) Calculate the difference between all of the immigrants and emigrants to see if the population is growing or shrinking. E) Add the number of births and subtract the individuals that die to see if the population's density is increasing or decreasing.
Which of the following involves positive feedback stimulation?
a. temperature control b. childbirth c. glucose concentration d. absorption of toxins e. muscle concentration
Which type of T cell improves the immune response?
What will be an ideal response?
Which of the following is normally found at the 5' end of a DNA strand?
A. a phosphate group B. a hydrogen bond C. a hydroxyl group D. histones E. a methyl group