Chapter 2: Traits and How They Change

Table of Contents

Chapter 2: Traits and How They Change

Section 2: Genetics

Heredity x Genetics Mendel's experiments Punnett Square

REVIEW: Genes are sections of DNA Genes have different Alleles A gene will code for a trait Each allele will code for a variation of

a trait We inherit 2 alleles One allele comes from the father and

another from the mother

1)What is Heredity? 2)What is genetics?

Heredity is the passing of traits from parents to offspring.

** Genetics is the branch of Biology that studies genes, heredity, and the variation of inherited traits in living organisms.

Dominant X Recessive

Dominant allele ? will show its effects on the phenotype whenever present in the genotype

Recessive Allele ? will show its effects on the phenotype only if 2 of them are present in the genotype ( inherited from both parents)

Ex: Cat fur ? short fur is dominant over long fur

A cat will have long fur if it inherits both alleles for long fur ? one from the father and one from the mother

If the cat inherits one allele for long fur and one for short fur, the cat will have short fur.

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