Page 164 - Science Course 3 (Book 1)

Mo4-L5a: What is Genetic Inheritance? Mo4-L5b: What Influences Traits?

A chromosome is a structure made of long chains of
DNA. Mo4-L5b What Influences Traits?

Humans have 23 pairs of chromosomes in each KEY CONCEPTS:
body cell. 1. How do environmental factors influence traits?
2. How do mutations influence traits?
Along each of these chromosomes lies hundreds or
thousands of genes

Key Concept Vocabulary A-Z

What is Genetic Inheritance? Let us learn some vocabulary
How are traits and genes related?
genotype
an organisms complete set of genes.

Eye color

Fast
Codes For

Wild-type

Brown fur Phenotype

Genotype

phenotype
how a trait appears or is expressed.

Genotype AA Aa aa

Phenotype A:
dominant/a
recessive

SUMMARY

What is Genetic Inheritance? Phenotype
A and a
Traits are either inherited or acquired. co-dominant
Inherited traits are passed from one
generation to the next.
mutation
a permanent change in the sequence of DNA, or the
nucleotides, on a gene or a chromosome.

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