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Chapter 19 SUMMARY

656 Chapter 19 NEL

Outcomes

Knowledge

• summarize the historical events that led to the discovery of
  the structure of the DNA molecule, as demonstrated by
  Franklin, Watson, and Crick (19.3)


• explain the limitations of variability due to gene linkage and
  the influence of crossing over on assortment of genes on
  the same chromosome (19.2)


• explain the relationship between variability and the number
  of genes controlling a trait (19.2)


• compare the pattern of inheritance produced by genes on
  the sex chromosomes to that of genes on autosomes, as
  investigated by Morgan and others (19.1)

STS

• explain that decisions regarding the application of scientific
  and technological development involve a variety of
  perspectives including social, cultural, environmental,
  ethical, and economic considerations (19.2, 19.3)

Skills

• ask questions and plan investigations (19.2, 19.3)


• conduct investigations and gather and record data and
  information (19.1, 19.2)


• analyze data and apply mathematical and conceptual
  models by analyzing crossover data for a single pair of
  chromosomes to create a chromosome map showing gene
  arrangement and relative distance (19.2)


• work as members of a team and apply the skills and
  conventions of science (all)

Key Terms

19.1

autosome

linked genes

sex-linked trait

recessive lethal

Barr body

MAKE a summary

1. Create a poster of a human genome that shows the
   principles of sex-linked genes and helps show the
   relationship between genes and chromosomes. Label
   the sketch with as many of the key terms as possible.
   Check other posters and use appropriate ideas to make
   your poster clear.
   2.Revisit your answers to the Starting Points questions at
   the beginning of the chapter. Would you answer the
   questions differently now? Why?

19.2

linkage group

locus (loci)

marker gene

19.3

continuity of life

bacteriophage

isotope

radioisotope

nucleotide

deoxyribose sugar

nitrogenous base

phosphate group

Go To

The following components are available on the Nelson

Web site. Follow the links forNelson Biology Alberta 20–30.

• an interactive Self Quiz for Chapter 19


• additional Diploma Exam-style Review Questions


• Illustrated Glossary


• additional IB-related material
  There is more information on the Web site wherever you see
  the Go icon in the chapter.

http://www.science.nelson.com GO

Beyond the Genome

Dr. Victor Ambros (professor of genetics at Dartmouth Medical

School), Dr. Katherine Wilson (associate professor of cell

biology at Johns Hopkins Medical School), and Dr. Wolf Reik,

(Babraham Institute in Cambridge, England) discuss their

research on how our cells really work, including how genes

“know” to turn on at the right times.

http://www.science.nelson.com GO

+ EXTENSION