Page 142 - Science Course 3 (Book 1)

Mo4-L2b: What are the Patterns of Inheritance?

Codominance A pedigree shows phenotypes of genetically related
family members.
an inheritance pattern in which both alleles can be
observed in a phenotype.

Parents

Offspring

polygenic inheritance
an inheritance pattern in which multiple genes
determine the phenotype of a trait.

Skin Pigmentation
Recessive Phenotype

Female with attached lobes
X
Male with attached lobes

Dominant Phenotype
aabbc AABBCC
(very light) (very light) Female with unattached lobes

Male with unattached lobes

X Key Concept

What are the Patterns of Inheritance?
AaBbCc AaBbCc How can inheritance be modeled?

Let’s Begin

Modeling Inheritance

A Punnett square
is a model used to
predict possible
genotypes and
phenotypes of
offspring.

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