Natural selection acting on a population may NOT favor
a. individuals at the left end of the range of variation.
b. individuals at the right end of the range.
c. extreme individuals at both ends of the range.
d. the intermediate individuals within the range.
e. obligate asexually reproducing organisms.
E
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Mules are __________ and are subject to
__________. a. all males; postzygotic reproductive isolation b. all females; postzygotic reproductive isolation c. all females; prezygotic reproductive isolation d. hybrids; postzygotic reproductive isolation e. hybrids; prezygotic reproductive isolation
The chromosome composition of 1 in 1,000 females is
a. XO. b. XX. c. XXX. d. XXY. e. XYY.
Strictly speaking, mitosis and meiosis are divisions of the
A) cytoplasm. B) nucleus. C) nucleus and chromosomes. D) chromosomes. E) nucleus, cytoplasm, and chromosomes.
Two forms of hemophilia are determined by genes on the X chromosome in humans. Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man. What is the probability that their first son will have hemophilia?
A) 1/2 B) 100% C) zero D) 1/4 E) 1/3