Crossing over usually contributes to genetic variation by exchanging chromosomal segments between
A) sister chromatids of a chromosome.
B) chromatids of nonhomologues.
C) nonsister chromatids of homologues.
D) nonhomologous loci of the genome.
E) autosomes and sex chromosome
Answer: C) nonsister chromatids of homologues.
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Which of the following is not an assumption of the Hardy-Weinberg law?
1.The population is very large 2.Heterozygotes are better than homozygotes 3.Mating is random 4.Mutation and migration are absent 5.No genotype is better than any other
To facilitate respiration, birds have extensions of their lungs called __________, which reach into all
parts of their bodies. a. tracheal tubes b. spiracles c. air bladders d. parabronchi e. air sacs
The antibiotic tetracycline binds to the 30S subunit of the ribosome as shown in Figure 20.1. The effect is to
a. Prevent attachment of tRNA. b. Prevent peptide bond formation. c. Prevent transcription. d. Stop the ribosome from moving along the mRNA. e. Prevent attachment of tRNA and mRNA.
Which of the following are examples of isomers?
(a) glucose and galactose (b) alanine and glycine (c) adenine and guanine (d) glycogen and cellulose