Background extinction is a measure of the ____
a. rate of species turnover at the end of geological eras
b. number of species that suffer extinction at the beginning of geological eras
c. steady rate of species turnover within a lineage throughout most of their evolutionary history
d. lowest rate of species turnover within a lineage observed within a geological era
e. animals that appear in the dense forest
ANSWER: c
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Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?
A) formation of three embryonic cell layers B) movement and alignment of many embryonic cells C) the formation of a gastrula D) the formation of specialized adult tissues
A true breeding black rabbit is crossed with a true breeding white rabbit to produce an F1 generation with 8 individuals. If blending inheritance were true, which of the following would represent the expected phenotype of the F1 generation?
A. 8 black rabbits, 0 white rabbits, 0 grey rabbits B. 2 black rabbits, 2 white rabbits, 4 grey rabbits C. 0 black rabbits, 0 white rabbits, 8 grey rabbits D. 4 black rabbits, 2 white rabbits, 2 grey rabbits E. 6 black rabbits, 2 white rabbits, 0 grey rabbits
If the protective coverings of the brain were damaged, the ____ would be damaged
a. ventricles b. thalamus c. medulla d. meninges e. reflexes
Your father has type B blood. Your mother has type O blood. You get tested and learn that your blood
is also type O. What does this tell you?
a. You were adopted and your parents didn't tell you. b. Your mother had a secret affair. c. Your father's genotype is IBi and your mother's genotype is ii. d. Your father's genotype is IBIB and your mother's genotype is ii. e. Your father's genotype is IAIB and your mother's genotype is ii.