Genetics definitions and Punnett Squares

What is a dominant allele?

• An allele that is always masked

• An allele that is only expressed when paired with a recessive allele

• An allele that is expressed when at least one copy is present

• An allele that has no effect on phenotype

What does the term "recessive" mean in genetics?

• A trait that always appears in offspring

• A trait that is masked unless the organism has two recessive alleles

• A trait that is dominant over all other traits

• A trait that is linked to mutations

Which of the following is an example of a heterozygous genotype?

• AA

• Aa

• aa

• BB

Which of the following is an example of a homozygous genotype?

• Bb

• Aa

• bb

• AB

What is the difference between genotype and phenotype?

• Genotype is the physical appearance, phenotype is the genetic makeup

• Genotype is inherited, phenotype is acquired

• Genotype is the genetic makeup, phenotype is the physical expression

• There is no difference

Tags

NGSS.HS-LS1-1

Two parents with the genotype Aa have children. What is the probability that their child will have red hair (aa)?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

If one parent has genotype AA and the other has Aa, what percentage of their children will have red hair (aa)?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If a person with genotype Aa has children with someone with genotype aa, what percentage of their children will have red hair?

• 0%

• 25%

• 50%

• 100%

Dimples (D = dimples, d = no dimples). Two heterozygous parents (Dd x Dd) have children. What percentage will have dimples?

• 0%

• 25%

• 50%

• 75%

Dimples (D = dimples, d = no dimples)

If one parent is homozygous dominant (DD) and the other is heterozygous (Dd), what percentage of their children will have dimples?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3