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66. DNA Replication (page 90)

Erratum (advanced printing only): The 3' 5' labels on the top most of the DNA molecule pictured have been transposed in error.

107. Consumers (page 143)

Erratum (advanced printing only): On energy and minerals schematic, key to arrows is transposed, and Sun to producer should be an energy arrow only (not a combined arrow). This has been corrected in the final print.

109. Food Webs (page 145)

Erratum in key to food web (advance copies only). Arrow should be labeled consumer-resource interactions.

184. Natural Selection (page 245)

Erratum (advance copies only): The column heading for the first table should read No. 1978 survivors.

Inheritance of Traits (chapter introduction, page 192)

Erratum: "Genes expressed by the cell can be regulated in different ways"

Activity 1, page 6: The Scientific Method

Diagram has been revised so that 'background research", which incorporates observation, has been removed and observation begins the information flow. Of course observation is a feature of the scientific method throughout, not just at the beginning. The flow represents a model of one possible methodological scenario.

Activity 21, page 32: Introduction to Cells

Label on bacterial cell should read: Nuclear membrane absent (chromosome is free is cytoplasm). Since revised to read: "Nuclear membrane absent. Single, naked chromosome is free in cytoplasm within a nucleoid region."

Students may wish to add to the lists:
Prokaryotic cells:
Single, circular chromosome of naked DNA.

Eukaryotic cells:
Multiple linear chromosomes consisting of DNA and associated proteins.

Activities 10-12

Contents should read:

10  Types of Data   12

11  Variables and Controls  13

12  A Case Study: Catalase Activity   14

Activities 195, page 266: Examples of Genetic Variation

Under "Qualitative traits" (correction in bold)
Qualitative traits are determined by one or two genes with a limited number of variants present in the population.