Unit 1 Science Review Part 2

What is a trait?

• A physical characteristic passed down from your mom

• A behavioral characteristic passed down from your dad

• A physical or behavioral characteristic passed down from your parents

• A behavioral characteristic passed down by your mom

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

What is a phenotype?

• Pair of alleles that determine a trait

• Observable physical trait

• Different forms of a gene

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

A person who is homozygous for a trait can have a genotype of....

• AA, Aa

• Aa, aa

• AA, aa

• aa

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

• Aa

• AA, aa

• AA, Aa

• AA

If "B" represents brown hair, and "b" represents blond hair, what will the genotype be for a homozygous brown haired person?

• BB

• Bb

• bb

If "B" is brown and "b" is blond, what is the phenotype of someone who's genotype is "bb"

• Brown Hair

• Blond Hair

• Red Hair

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

• pp

• Pp, pp

• PP, Pp

• PP, pp