Which outcome could help you identify a trait whose expression is determined by the effects of two or more genes (polygenic inheritance)?
A. A mating between a homozygous and a heterozygous individual produces more than the expected number of offspring expressing the dominant trait.
B. The trait varies along a continuum in the population.
C. All of the alleles of the gene for that trait are equally expressed.
D. Pleiotropy occurs.
B. The trait varies along a continuum in the population.
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The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms
A) incorporate carbon dioxide via the acetyl-CoA pathway. B) incorporate carbon dioxide via the Calvin cycle. C) incorporate carbon dioxide via the reverse citric acid cycle. D) utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism.
What is the function of normal biota of the respiratory tract?
A. Provides antibodies B. Microbial antagonism C. Competes with pathogens for resources and space D. Both [competes with pathogens for resources and space] and [microbial antagonism] are correct. E. All of these three functions are correct.
Cells very similar to choanoflagellates are
found in: a. Land plants b. Sponges c. Mold d. Bacteria e. None of these
The presence of which hormone in a female’s urine
indicates that she is pregnant? a. luteinizing hormone b. follicle-stimulating hormone c. chorionic gonadotropin d. progesterone e. estrogen