Why are organisms with an odd number of chromosome sets usually sterile?
A) Almost all gametes will have an unbalanced set of chromosomes.
B) Chromosomes will fail to segregate independently during meiosis I.
C) Chromosomes will fail to segregate independently during meiosis II.
D) Because an odd number of chromosomal sets is present, meiosis will not occur at all.
A) Almost all gametes will have an unbalanced set of chromosomes.
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A flower develops from the end of the floral shoot, called the receptacle
a. True b. False
Where is the carboxyl group located in this diagram?
a. The carboxyl group is every unlabeled carbon.
b. The carboxyl group is labeled CH3.
c. The carboxyl group is labeled COOH.
d. The double-bonded carbons are carboxyl groups.
The principal point of Darwin’s theory of evolution
by natural selection is that a. long-term heritable changes in organisms are caused by use and disuse. b. mutations that adapt an organism to a given environment always arise in the greatest frequency in the organisms that occupy that environment. c. mutations are caused by all sorts of environmental influences. d. survival of characteristics in a population depends on a favoring of some forms of a given trait over others in nature. e. mutations mostly have favorable effects.
Vibrio cholerae causes Asiatic cholera. It has a corkscrew shape, so we would say it has this form
A) clostridia B) bacillus C) coccus D) spirillum