Sexual reproduction reorganizes genetic material but doesn't create it; how does new genetic information appear in a population?
A) from the fusion of chromosomes from two individuals
B) from chromosome-sorting errors in mitosis
C) permanent changes, called mutations, alter the molecular structure of a gene
D) from the pairing and sorting of different alleles
E) from the union of two gametes, each produced within a separate individual
Answer: C) permanent changes, called mutations, alter the molecular structure of a gene
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In a colony of 100 guinea pigs, 16 show the recessive trait of bristly hair. What is the percentage of
heterozygotes in the population?
a. 48 percent b. 52 percent c. 36 percent d. 24 percent e. 84 percent
Matching. Choose the best matching element
1. ___ anticodon 2. ___ McClintock 3. ___ codon 4. ___ messenger RNA 5. ___ polysome 6. ___ promoters 7. ___ transcription 8. ___ translation A. RNA-directed synthesis of polypeptide chains B. sites at which RNA polymerases can bind and initiate transcription C. binds to small subunit platform of a ribosome D. guided and catalyzed by RNA polymerases E. polypeptide chain elongation proceeds independently at each body in this cluster F. discovered transposons G. a tRNA triplet opposite a codon H. a set of three nucleotides
__________ are thickened underground stolons used
for nutrient storage. a. Stolons b. Rhizomes c. Bulbs d. Corms e. Tubers
Fossils would include
a. skeletons. b. shells. c. seeds. d. tracks. e. all of these.