Page 188 - Science Course 3 (Book 1)

Mendel’s Experiments Mo5-L1a: How are Traits Passed?
Lesson 1

Let’s Begin

In this topic, you will learn the following
lessons: From Parent to Offspring

Mo.5–L1a: How are Traits Passed? Heredity is the passing of traits from parent to
Mo.5–L1b: What did Mendel Discover About offspring.
Heredity?
Genetics is the study of how traits pass from
parents to offspring.

Mo5-L1a How are Traits Passed? For most organisms, genes are sections of DNA that
contain information about a specific trait of that
organism.
KEY CONCEPTS:
1. How are traits inherited?
2. Why do scientists study genetics?

Unaffected Unaffected
Vocabulary A-Z Carrier Carrier

Let us learn some vocabulary

Heredity
the passing of traits from parents to offspring.

Affected Unaffected Unaffected Unaffected
25% carrier carrier 25%
50%
Unaffected Unaffected
Carrier Carrier

A gene with different information for a trait is called
an allele.

Each chromosome pair has genes for the same
traits.

A gene’s alleles are in the same location on each
Affected Unaffected Unaffected Unaffected chromosome of a pair.
25% carrier carrier 25%
50%
Eye Color
Genetics
the study of how traits are passed from parents to Blood type
offspring.

Hair Color

Father with abnormal Mother with normal X Growth
gene on X sex sex chromosomes
chromosome
Parents : XY XX

Offspring : XX XX XY XY

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