The chromosome number is halved by ____ and restored by ____
a. independent assortment; meiosis
b. mitosis; meiosis
c. meiosis; mitosis
d. meiosis; fertilization
e. mitosis; fertilization
ANSWER: d
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According to one study, the heritability of IQ score in humans has a value of 0.52. What does this tell us about the role of "nature" versus "nurture" in determining intelligence in humans?
A) Intelligence is a qualitative trait, affected by both genetics and the environment, and it can't be predicted by heritability scores. B) Children of highly intelligent parents will likely be very intelligent, regardless of the environment in which they're raised. C) There is an approximately equal chance that children of intelligent parents will be as intelligent as their parents, depending on the environment in which they're raised. D) High heritability values don't mean that the intelligence of children can be accurately predicted because the environment plays a strong role.
Aerobic cellular respiration takes place in
A. both plants and animals. B. animals but not plants. C. plants but not animals. D. bacteria only.
Triplo-X syndrome is when a woman has an extra X chromosome. Using your knowledge of chromosomal inheritance, which of the following statements is most likely to be correct?
a) A woman with three X chromosomes produces oocytes with two X chromosomes, which could result in her giving birth to a XXY son. b) Women with this condition are usually marked by profound mental impairment. c) This condition does not exist because a fetus with three X chromosomes cannot survive birth. d) Women with this disease are able to give birth to normal children with the normal number of sex chromosomes. e) Both a) and d) are likely to be correct.
What evidence supports the theory of endosymbiosis for the development of cells with mitochondria and chloroplasts? (Select all that apply.)
a) the presence of circular DNA in mitochondria and chloroplasts b) the size of mitochondria and chloroplasts is similar to that of modern-day bacteria c) the double membrane around mitochondria and chloroplasts d) mitochondria and chloroplasts divide by fission, the same method observed for bacteria