Page 193 - Science Course 3 (Book 1)

Mo5-L1b: What did Mendel Discover About Heredity?

Recessive Inheritance Key Concept

What did Mendel Discover About
Carrier Carrier Heredity?

Nn Nn What did Mendel investigate and discover about
heredity?

NN Nn Nn nn
Normal Carrier Carrier Affected

N n

N NN Nn

n Nn nn

Dominant Inheritance

Affected Normal
Father Mother
Dd dd

Dd dd Dd dd
Affected Normal Affected Normal

d d

D DD Dd

d dd dd

SUMMARY

What did Mendel Discover About Heredity?

Through selective breeding, Mendel showed
that some traits are dominant and some traits
are recessive.

An organism’s genotype can be homozygous
or heterozygous.

Each gene has two types of alleles, dominant
or recessive.
A dominant allele is expressed over a
recessive allele.

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