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BIOLOGY 3 CH-9 REVIEW
WORKSHOP
ContentsContentsContentsContents
�Genetic Concepts�Single Gene Inheritance�Single Gene Inheritance�Multiple Gene Inheritance�Sex-linked Inheritance
Figure B: Anatomy of pea plant
Figure A: Gregor Mendal; “the
father of modern genetics”
Character Trait
Color Purple
# of stamen 7
Table 1: Examples of characters and
traits of Figure B
CharacterCharacterCharacterCharacter TraitTraitTraitTrait
Table 2:Table 2:Table 2:Table 2: The seven pea
characters studied by Mendal
Figure C: Crosses taking one character (flower color)
Alleles
P
p
Table 3: Possible alleles
Genotype Phenotype
PP Purple
Pp Purple
pp White
Table 4: Possible genotypes
and phenotypes Figure D: Explains Figure C in terms of allele
distribution; discussing genotypes and
phenotypes
Homologous Chromosomes Homologous Chromosomes Homologous Chromosomes Homologous Chromosomes –––– Alleles Alleles Alleles Alleles
Homologous Pairs 1
Chromosomes 2
Gene Loci 3
Alleles P, a, B, b
Genotypes PP, aa, Bb
Figure E: Homologous Chromosomes with
labeled components
Table 5: Explanation of Figure E
The Punnet Square___
Alleles
G (Dom)
g (Rec)
Gg x Gg
GGGG gggg
Genotypes
GG
Gg
gg
Phenotypes
GG Green Eyes
Genotypes Phenotypes Prob.
GG Green Eyes 25%
Gg Green Eyes 50%
gg Blue eyes 25%
GGGG
gggg
GGGGGGGG GgGgGgGg
GgGgGgGg gggggggg
GG Green Eyes
Gg Green Eyes
gg Blue Eyes
Independent Assortment
Inherited DisordersInherited DisordersInherited DisordersInherited Disorders
Figure F: Child with Cystic
Fibrosis (Recessive Disorder)Figure G: Dr. Michael C. Ain
Achondroplasia (Dominant Disorder)
Incomplete Dominance
Genotypes Phenotypes
RR
Rr
rr
Pleiotropy
Text H: Sickle-Cell disease; example of a pleiotropy (single gene
influencing multiple characters)
Polygenic Inheritance
Linked Genes
Crossing Over
Crossing Over (cont.)
Sex Chromosomes
Sex-linked Genes