Microsoft Word - blank.doc

Chapter 18 SUMMARY

622 Chapter 18 NEL

Outcomes

Knowledge

• describe the evidence for dominance, segregation, and the
  independent assortment of genes on different
  chromosomes, as investigated by Mendel (18.1, 18.2)


• compare ratios and probabilities of genotypes and
  phenotypes for dominant/recessive alleles, multiple alleles,
  and incompletely dominant or codominant alleles, epistatic,
  and pleiotropic alleles (18.2, 18.3, 18.4, 18.5)


• explain the relationship between variability and the number
  of genes controlling a trait (18.3)

STS

• explain that decisions regarding the application of scientific
  and technological development involve a variety of
  perspectives (18.3)

Skills

• ask questions and plan investigations by designing a plan
  for collecting data to demonstrate human inheritance (18.2)


• conduct investigations and gather and record data by
  performing an experiment to demonstrate inheritance of a
  trait controlled by a single pair of genes (18.5), and by
  designing and performing an experiment to demonstrate
  that an environmental factor can cause a change in the
  expression of genetic information in an organism (18.4)


• analyze data and apply mathematical and conceptual
  models by predicting, quantitatively, the probability of
  inheritance from monohybrid and dihybrid (18.2, 18.4); using
  Punnett squares to interpret patterns and trends associated
  with monohybrid and dihybrid patterns of inheritance (18.2,
  18.4); performing, recording, and explaining predicted
  phenotypic ratios versus actual counts in genetic crosses to
  show a relationship between chance and genetic results
  (18.2, 18.4, 18.5); and drawing and interpreting pedigree
  charts from data on human single-allele and multiple-allele
  inheritance patterns (18.3, 18.4)


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

Key Terms

18.1

18.3

pedigree chart

18.4

MAKE a summary

1. Create a concept map that shows the principles of
   inheritance of traits. Label the sketch with as many of the
   key terms as possible.
   2.Revisit your answers to the Starting Pointsquestions at
   the start of the chapter. Would you answer the
   questions differently now? Why?

progeny

dominant trait

recessive trait

allele

homozygous

heterozygous

genotype

phenotype

segregation

18.2

phenotypic ratio

Punnett square

genotypic ratio

test cross

pleiotropic gene

wild type

mutant

incomplete dominance

codominance

18.5

dihybrid cross

selective breeding

inbreeding

polygenic trait

epistatic gene

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 18


• 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

Spawning Trouble

Dr. Daniel Heath, (University of Windsor) has discovered that

the eggs of captive-bred salmon are getting smaller each year.

The lack of selective pressure on the eggs in a hatchery may

be the cause, since more small fish are surviving than would

be if the eggs developed in the wild. Dr. Heath is concerned

this will lead to health problems in the wild population, and if

this may also be a general problem with captive breeding

programs for other animals, including endangered species.

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

+ EXTENSION