Assume that a mutation occurs in the gene responsible for the production of hexosaminidase A, such that only about 50% of the enzyme activity is found in the heterozygote compared with a homozygous normal individual. If heterozygotes are phenotypically
normal, we would say that the mutant allele is ________ to its normal allele.
A) epistatic
B) auxotrophic
C) recessive
D) dominant
E) gain of function
Answer: C
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Rats
a. are carriers of human pathogens. b. spread bubonic plague via infected fleas. c. infest rice fields, significantly reducing the yield. d. cause billions of dollars of annual economic loss. e. do all of these.
Which organizational unit includes the fewest species of organisms?
a. class b. biosphere c. community d. population e. ecosystem
The human population may continue to increase even though it surpasses carrying capacity
Indicate whether the statement is true or false
Mammalian, bird, and crocodile hearts have four chambers with two separate atria and ventricles to ensure ________ different circuits for blood flow.
A. two B. eight C. four D. three