A breeding experiment that checks for the relationship between the alleles of a single trait is called a ________.
a. Punnett square
b. None of these choices
c. dihybrid cross
d. test cross
e. monohybrid cross
e
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The occipital lobe of the brain is responsible for
a. coordination of hands and fingers. b. speech. c. memory. d. the senses of taste and smell. e. vision.
Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive. Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes. Why?
A. "Pleiotropy"-the gene that is being selected for this trait may have the second effect of being lethal. B. The lethal recessive gene may be incompletely dominant. C. Spreading the gene among offspring of both sexes will increase the likelihood it will be sex-linked and expressed. D. "Epistasis"-selection for the desired trait may result in "uncovering" the lethal gene. E. The selective-mating of closely related individuals, or inbreeding, increases the chances that two recessive genes will "meet" in offspring.
Which of the following does NOT constitute an advantage of using two antibiotics together?
A) It can prevent drug resistance. B) It lessens the toxicity of individual drugs. C) Two are always twice as effective as one. D) It allows treatment to be provided prior to diagnosis. E) All of these are advantages of using two antibiotics together.
Which cascade is activated when components of the complement pathway recognize and bind to pathogen membranes?