Today’s Objectives:
SOL BIO.2e,
BIO.6d-BIO.6g
Given a description of Mendel’s work
with garden peas, explain and/or
identify Mendel’s principles (dominance,
segregation, independent assortment,
or the processes involved).
 Identify the following: recessive,
genetics, gene, genotype, phenotype,
heredity, heterozygus, homozygous.

Gregor Mendel (1823-1884)

Augustinian monk
 Mendel was the first
person to trace the
characteristics of
successive generations of
a living thing (pea plants).
Mendel’s Laws of Heredity

Hereditary factors do not combine, but are
passed intact (Law of Segregation)
 Each member of the parental generation
transmits only half of its hereditary factors to
each offspring (with certain factors "dominant"
over others) (Law of Dominance)
 Different offspring of the same parents
receive different sets of hereditary factors
(Law of Independent Assortment)
Why Peas?
 Quick
reproductive cycle
 Self-pollinating
 He studied simple traits, traits that
occurred in only one of two
possible variations.
Definitions
 Trait
 Genetics
 Gene
 Hybrid
 Allele
 Phenotype
 Dominant
 Genotype
 Recessive
 Homozygous
 Heredity
 Heterozygous