You are given an embryo with eight cells and you carefully separate them and allow them to develop in separate containers. Each of the cells forms a complete embryo that develops normally into an adult animal. How would you categorize your animal?
A. It has indeterminate cleavage.
B. It has determinate cleavage.
C. It is a protostome.
D. It is an annelid, mollusk, or arthropod.
E. It has spiral cleavage.
A. It has indeterminate cleavage.
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Where are neurotransmitter receptors located?
A) the nuclear membrane B) the nodes of Ranvier C) the postsynaptic membrane D) synaptic vesicle membranes E) the myelin sheath
DNA sequences comprising open reading frames (ORFs) correspond to the coding regions of genes called ____________________
Fill in the blank(s) with correct word
Martin Wikelski and L. Michael Romero (Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376-86) measured the snout-to-vent (anus) length of Galápagos marine iguanas and observed the percent survival of different-sized animals, all of the same age. The graph shows the log snout-vent length (SVL, a measure of overall body size) plotted against the percent survival of these different size classes for males and females. Currently the only predators of Galápagos marine iguanas are Galápagos hawks. Iguana body size is not correlated with risk of hawk predation, although small iguanas can sprint faster than large iguanas. If predators (for example, cats) that preferably catch and eat slower iguanas are introduced to the island,
iguana body size is likely to _____ in the absence of other factors; the iguanas would then be under _____ selection. A. increase; disruptive B. decrease; disruptive C. stay the same; stabilizing D. decrease; directional E. increase; directional
Two genes, A and B, are located 30 map units apart. The dihybrid shown in the attachment is mated to a tester aa bb. What proportion of the offspring is expected to be dominant for both traits?
A. 0% B. 15% C. 30% D. 35% E. 70%