What Is Genetics

What is an allele?

• A trait

• Different forms of a gene

• DNA

• Different types of parents

What is a genotype?

• Pair of alleles that determine a specific trait

• Observable physical trait

• A trait that is observed with only one copy of an allele

Tags

NGSS.HS-LS3-2

What is a phenotype?

• Pair of alleles that determine a trait

• Observable physical trait

• Different forms of a gene

Tags

NGSS.MS-LS4-4

What is a dominant gene?

• A trait that is observed when there are one OR two copies of the allele

• A trait that is observed only when there are two copies of the allele

• A trait that can be hidden in a generation

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If a person is heterozygous for a trait, their genotype can be...

• Aa

• AA, aa

• AA, Aa

• AA

If a person is heterozygous for brown hair, what is their genotype?

• BB

• Bb

• bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Heterozygous: Different, Homozygous:_____________

• The same

• Less Than

• Greater Than

• 4 copies

P= purple petals and p= white petals. What genotype(s) would result in purple petals?

• pp

• Pp, pp

• PP, Pp

• PP, pp

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How many copies of the recessive gene must there be for that phenotype to show up?

• 1

• 2

• 3

• 4

Using the Punnett Square, identify the correct Genotypic ratio

• 2:2:1

• 1:2:1

• 2:1:1

• 1:1:1

Tags

NGSS.HS-LS3-3