A person's spleen may be removed (splenectomy) if it becomes enlarged due to certain types of cancer, traumatic injury, or damage. What part of the immune system will be most affected by a splenectomy?
A) internal innate immunity
B) external innate immunity
C) adaptive immunity
D) lymphatic system
D
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In a certain breed of chicken, an incomplete dominant gene controls color. The homozygous black (BB), when crossed
with the homozygous splashed-white (bb), produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a true-breeding black with a single comb and a true-breeding splashed-white with a rose comb. What will be an ideal response?
Four of the five structures listed below are parts of
the same sense organ. Select the exception. a. ommatidium b. retina c. crystalline cone d. photoreceptor e. lens
Why are dwarf pea plants shorter than other pea plants?
a. because they produce very little gibberellin hormone b. because they have an altered gibberellin amino acid sequence c. because the enzymes involved in gibberellin synthesis are missing d. because they cannot make any gibberellin
Which of the following is a process by which an initial set of genes turns on a second set of regulatory genes, which eventually turns on a third set of genes?
A) the sonic hedgehog sequence B) the genetic cascade C) developmental chain reaction D) somite production E) gastrulation