Page 141 - Science Course 3 (Book 1)

Mo4-L2a: What Controls Traits? Mo4-L2b: What are the Patterns of
Inheritance?

Key Concept Mo4-L2b What are the Patterns of

What Controls Traits? Inheritance?
KEY CONCEPTS:
How do alleles determined the expression of 1. How can inheritance be modeled?
traits? 2. How do some patterns of inheritance differ

from Mendel’s model?

Vocabulary A-Z

Let us learn some vocabulary

Punnett square
a model that is used to show the probability of all
possible genotypes and phenotypes of offspring.

X R w

R

RR Rw

w

Rw ww

Incomplete dominance
an inheritance pattern in which offspring’s phenotype
SUMMARY is a combination of the parent’s phenotypes.

What Control Traits?
The genes for traits are located on
chromosomes.

Red White
RR rr

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