©McGraw-Hill EducationConsider the cladogram shown. Which pair of species shares the greatest number of derived characters (synapomorphies)?
A. 6 and 1
B. 4 and 2
C. 5 and 4
D. 6 and 2
E. 5 and 2
Answer: A
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When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so rapidly in succession that the postsynaptic neuron's membrane potential has not returned to the resting potential before the second EPSP arrives,
the EPSPs add together producing _____. A) temporal summation B) spatial summation C) tetanus D) the refractory state E) an action potential with an abnormally high peak of depolarization
Two genes (A and B) are located on each of two pairs of homologous chromosomes. In a tetrad, one sister chromatid
contains alleles ab, while the other sister chromatid contains alleles AB (upper and lower case indicate different alleles of the same gene). Which genetic combinations are possible in the four gametes that are produced from a single chiasma between these chromosome pairs?
a. Ab, AB, ab, aB b. Ab, Ab, aB, aB c. Aa, Bb, ab, Ab d. Ab, Ab, AB, AB e. AB, AB, ab, ab
When two alleles of the same gene are identical, the individual carrying those alleles is said to be ____
a. dominant b. heterozygous c. recessive d. genotypical
e. homozygousThe simplest hypothesis for the original function of Hox genes is that they were expressed in the ________ [two words] in early animals
Fill in the blank(s) with correct word