What is the type of speciation that can occur in an
instant with a change in chromosome number?
a. temporal
b. mechanical
c. behavioral
d. ecological
e. polyploidal
Answer: e
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An embryo is protected from most mechanical impacts because of the ____
a. amniotic cavity b. allantois c. placenta d. yolk sac e. chorion
Two parents with Type A and Type B blood have a child with Type AB blood. How is this possible?
A. Type A blood is incompletely dominant to Type B blood. This means that individuals with alleles for both Type A and Type B will express a blended intermediate between these two blood types. B. Type A blood is codominant with Type B blood, so both alleles are expressed equally. C. Type A blood is co-recessive with Type B blood, so as long as there is not a dominant blood type present, both recessive alleles will be expressed equally. D. This is not possible. The child cannot be their biological child.
Centimeter-thin layers of earth that are rich in iridium give evidence to support the
A. allopatric theory. B. ecological isolation theory. C. gradualism theory. D. impact theory. E. punctuated equilibrium theory.
The miR-200 class of miRNAs have what effect on human health?
A. They contribute to Alzheimer's disease. B. They regulate the heartbeat. C. They reduce tumor growth. D. They contribute to cancer formation.