In a Punnett square, the letters on top of the square and on the side of the square represent ____
a. offspring genotypes
b. zygote genotypes
c. parental gametes
d. offspring phenotypes
e. parental phenotypes
ANSWER: c
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Tuberculin skin testing
A. uses a purified protein filtrate of Mycobacterium tuberculosis. B. will be positive in active TB. C. involves the injection of PPD intradermally. D. will be positive if person has had previous exposure. E. All of the choices are correct.
Pecking behavior in young herring gulls is triggered primarily by ____
a. hunger b. the shape of the parent gull's head c. a red spot on the bill of the parent d. the overall body silhouette of the parent bird e. presence of predators
Which of the following is a correct pair based on their shared characteristics?
a. the universe and a closed system b. the universe and an open system c. an ocean and an open system d. an ocean and a closed system
Individual prokaryote cells are ________ eukaryote cells; collectively, all prokaryote cells on Earth ________
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