In an autosomal dominant disorder ____
a. both parents must be carriers in order for the child to inherit the disorder
b. homozygous recessive genotypes do not survive birth
c. the trait is always expressed at birth
d. a carrier rarely lives long enough to have children
e. the heterozygote condition expresses the trait
ANSWER: e
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Skin color is an example of a human trait influenced by natural selection. What factor(s) has/have directly shaped variation in skin color? Select all that apply
A. temperature B. disease C. diet D. intensity of sunlight
Which of the following statements about invasive species is false?
A. The effect of invasive species on natural communities is always a reduction in diversity. B. Humans are responsible for dramatic increases in the number of invasive species. C. Invasive species often thrive in new areas because they have few natural predators. D. Introduction of invasive species has more devastating effects on islands because of the smaller number of predators and competitors in these systems. E. Invasive species reduce community diversity through displacement, competition, and predation.
Recent research has demonstrated a correlation between the presence of certain types of Gram-positive bacteria in the human gut with obesity and type 2 diabetes. These findings best support which of the following statements?
A. The presence of Gram-positive bacteria in the human gut causes obesity and type 2 diabetes. B. Gram-positive bacteria compose the majority of normal microbiota in the human gut of people with obesity and type 2 diabetes. C. Obesity and type 2 diabetes is caused by normal microbiota in the human gut. D. Normal microbiota may significantly impact human health and disease.
Attribute one of these statements to the blastopore.
A. it occurs in both protostomes and deuterostomes. B. it is the opening from the coelom to the outside of the animal. C. it is the opening from the archenteron to the coelom. D. it can develop into the brain in some animals. E. it can develop into the gut in some animals.