A brown-eyed couple already has a child with blue eyes. What is the probability that their next child will have blue
eyes, assuming that the brown eye allele is dominant and the blue eye allele is recessive?
a. 0
b. 1/4
c. 1/2
d. 3/4
e. 1
b
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It is believed that cetaceans evolved from:
a. a terrestrial mammal. b. a pinniped. c. fishes. d. polychaetes. e. dinosaurs.
Laboratory experiments about bacterial mutation rates have demonstrated which of the following?
A) Bacterial mutation rates rarely evolve in short-term laboratory experiments; they are a relatively fixed feature of a species biology. B) In short-term laboratory experiments, bacterial mutation rates often evolve to be higher because higher mutation rates result in higher fitness. C) In short-term laboratory experiments, bacterial mutation rates often evolve to be lower because mutations are typically deleterious for organisms. D) Depending on the experiment, bacterial mutation rates sometimes evolve to higher rates, and other times evolve to lower rates.
Which piece of evidence BEST supports the "multiregional evolution" model of the evolution of modern humans?
A) Molecular clocks date the last common ancestor of modern humans to about 171,500 years ago. B) Present-day human populations from Africa have greater genetic diversity than non-African populations. C) African Homo ergaster/erectus appear almost simultaneously with Asian Homo erectus, 1.6 to 1.9 million years ago. D) Both Asian fossil Homo erectus and modern Asian human populations show a high frequency of shovel-shaped incisors. E) There is no solid evidence supporting the multiregional hypothesis.
Sucrose is an oligosaccharide made up of which one of the following sugars?
A) glucose and glucose B) deoxyribose and ribose C) starch and glycogen D) maltose and glucose E) glucose and fructose