Smooth fur dominates rough fur; black and white fur are incompletely dominant and result in gray. A rough gray crossed with a rough gray would produce
A. all rough gray.
B. 1/2 rough black, 1/2 rough white.
C. 1/2 rough black, 1/4 rough gray, 1/4 rough white.
D. 1/4 rough black, 1/2 rough gray, 1/4 rough white.
D. 1/4 rough black, 1/2 rough gray, 1/4 rough white.
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In 1882, the tropical volcanic island Krakatoa
exploded and was reduced to an abiotic island covered by a thick layer of volcanic ash. By 1933, populations of all of the following organisms were present. Which population was probably established after the others? a. ferns b. bacteria c. insects d. rodents e. mosses
Which is an accurate pairing of a key excretory function with its definition?
a. Filtration happens when blood pressure forces water, nitrogenous waste, and valuable solutes from the blood into the collecting duct. b. Reabsorption is the reclamation process that returns valuable solutes and water to the nephron from the capillaries. c. Secretion transports certain toxins, drugs, and excessive ions from the filtrate to the capillaries. d. Excretion moves urine, the processed filtrate, out of the kidney, through the ureter, the bladder, and finally out of the body via the urethra. e. Reabsorption is the process in which toxins, drugs, and excessive ions that remain in the blood after filtration are transported into the nephron for disposal in the urine.
Which of the following can only be viewed by electron microscopy?
A) frog eggs B) viruses C) nuclei D) mitochondria E) bacteria
A popular research technique used to associate patterns of genetic variation with phenotypes that is based on the concept of linkage, but considering all of the chromosomes at once, is
A) gene expression profiling. B) genome sequencing. C) genome-wide association studies. D) assisted reproductive technologies.