In a heterozygote for two linked genes, both dominant alleles are on one chromosome and both recessive alleles are on another chromosome. The genes are said to be in
A) recombination.
B) repulsion.
C) cis.
D) trans.
C) cis.
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The advantage of nitrogen fixation to the host plant is
A. the ability to synthesize amino acids and proteins from the ammonia produced. B. the production of nucleotides required for nucleic acid synthesis. C. the production of antibiotics that protect the plant against pathogenic soil bacteria. D. the ability to use nitrogen gas instead of oxygen gas in cellular respiration, particularly when the soil is compacted.
Antibodies can be produced against all of the
following EXCEPT a. viruses. b. bacterial cell walls. c. fungi. d. bacterial DNA. e. all of these can be bound by an antibody.
The land plants are probably descendants of which of these groups?
a) green algae b) red algae c) brown algae d) angiosperms
Whose work with fruit flies presented the first clear evidence that the genes determining Mendelian traits reside on chromosomes?
A. Thomas Hunt Morgan B. Gregor Mendel C. Karl Correns D. Walter Sutton