Each human ?-globin locus contains two ?-globin genes, ?1 and ?2, and most individuals have two copies of the locus. Which of the genotypes would result in the most severe phenotype? (A"–" represents a deletion allele.)
A) ?1 ?1 / ?2 ?2
B) ?1 – / ?2 –
C) ?1 ?1 / – –
D) ?1– / ?2 ?2
E) ?1 – / – –
E) ?1 – / – –
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The biological species concept of Ernst Mayr cannot be applied to
A. sympatric organisms. B. allopatric organisms. C. eukaryotic organisms. D. prokaryotic organisms. E. asexually-reproducing organisms.
The firefly (Photinus†granulatus) and the zebra mussel (Dreissena†polymorpha) are both members of the kingdom Animalia. This indicates that they must also both be members of the same
A. species B. genus C. order D. phylum E. domain
Which of the choices lists the three phases of the ovarian cycle in the correct order?
A. follicular, luteal, ovulation B. follicular, proliferative, secretory C. luteal, ovulation, secretory D. follicular, ovulation, luteal E. luteal, secretory, ovulation
Which of the following has increased as a direct result of stratospheric ozone depletion?
a. CO2 b. UVB c. CFCs d. nitrous oxides e. sulfur oxides