A plant breeder is attempting to breed a variety of corn with high oil content. Each generation, he crosses only those plants that have the highest oil content. Over time, the average oil content of his plants increases. He does this with two strains of plants. For Strain A, h2 = 0.3. For Strain B, h2 = 0.6. Which strain will more quickly increase in oil content with selection?
a. Strain A
b. Strain B
c. Strain C
d. No difference
Answer: b. Strain B
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Dating to about 3.5 million to 3 million years ago, the famous fossil "Lucy," found in northern
Ethiopia, represents a member of which species?
a. Homo habilis b. Homo erectus c. Australopithecus africanus d. Australopithecus afarensis e. Homo neanderthalensis
Hydrogenation is a _____
a. manufacturing process that adds hydrogen atoms to carbohydrates b. natural process that that adds hydrogen atoms to carbohydrates c. manufacturing process that adds hydrogen atoms to oils d. natural process that removes hydrogen atoms from fats e. manufacturing process that removes hydrogen atoms from fats
In an autosomal dominant disorder such as Huntington's, two heterozygous parents have the
probability of passing the gene on to ____ percent of their children. a. 50 b. 0 c. 100 d. 25 e. 75
Muscular movements that mix food in the lumen of the small intestine are referred to as
A) elimination. B) secretion. C) absorption. D) muscularis. E) segmentation.