After you have studied this chapter, you should be able to:
Distinguish among genome, gene, and chromosome (p. 917)
Explain how the human genome is an economical storehouse oF
inFormation. (p. 917)
Explain how the environment in±
uences how genes are expressed.
24.2 Modes of Inheritance
Describe a karyotype, and explain what it represents. (p. 918)
Explain the basis oF multiple alleles oF a gene. (p. 919)
Distinguish between heterozygous and homozygous; genotype and
phenotype; dominant and recessive. (p. 919)
Distinguish between autosomal recessive and autosomal dominant
inheritance. (p. 920)
24.3 Factors That A±
ect Expression of Single Genes
Explain how and why the same genotype can have di²
types among individuals. (p. 924)
24.4 Multifactorial Traits
Describe and give examples oF how traits may be determined by
genes and the environment. (p. 924)
24.5 Matters of Sex
Describe how and when sex is determined. (p. 927)
Explain how X-linked inheritance di²
ers From inheritance oF autosom-
al traits. (p. 928)
Discuss Factors that a²
ect how phenotypes may di²
er between the
sexes. (p. 928)
24.6 Chromosome Disorders
Describe three ways that chromosomes can be abnormal. (p. 929)
Explain how prenatal tests provide inFormation about chromosomes.
24.7 Gene Expression Explains Aspects of Anatomy and Physiology
Describe the type oF inFormation gene expression prof
Explain how a DNA microarray works. (p. 933)
some—a “colored body” in a cell’s nucleus
that includes the genes.
etics—the study oF inheritance oF characteristics.
erent members oF a
ologous chromosomes—pair oF
chromosomes that have similar genetic inFormation.
type—a chart that displays chromosomes
in size order.
somy—one type oF chromosome present in
only one copy.
show, be seen:
otype—physical appearance or health
condition that results From the way genes are expressed in
somy—three copies oF a chromosome.
Note the similar prof
the Four generations oF this
Family. We do not always
know how inFormation in
DNA sequences maniFests
as a trait such as Facial