Two parents who do not have sickle cell anemia have a child that has the disease. The parents are both:
A. homozygous for the sickle cell allele.
B. heterozygous for the sickle cell allele.
C. homozygous for the normal allele.
D. pleiotropic for the sickle cell allele.
E. epistatic for the sickle cell allele.
Answer: B
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Fill in the blank (s) with the appropriate word.
Gibberellins were discovered as a result of:
A. extractions of this hormone from plants B. a fungal disease on rice C. an application of the hormone accidentally D. many years of experiments to isolate it from plants E. discovery of its relationship to auxins
Sympatric populations are able to coexist without competing for resources due to morphological differences known as
____.
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