Heredity and Punnett Squares Quiz

What is a Punnett Square used for in genetics?

• To determine the chemical composition of DNA

• To predict the outcome of genetic crosses

• To measure the physical traits of an organism

• To identify the cellular structure of genes

Which term describes the physical appearance of an organism's trait?

• Phenotype

• Genotype

• Allele

• Chromosome

What does it mean if an organism is homozygous for a trait?

• It has two different alleles for a trait

• It expresses two dominant traits

• It has two identical alleles for a trait

• It cannot express the trait

What is the genotype of an organism?

• The physical appearance of a trait

• The recessive allele in a pair

• The dominant allele in a pair

• The genetic makeup

In a Punnett Square, what does a capital letter represent?

• A recessive allele

• A dominant allele

• A phenotype

• A genotype

If an organism has a genotype of Aa for a trait, what can we say about its alleles?

• It is homozygous dominant

• It is homozygous recessive

• It is heterozygous

• It cannot express the trait

Tags

NGSS.HS-LS3-1

Which combination of alleles would be considered heterozygous?

• Aa

• aa

• AA

• None of the above

What is the probability of producing a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-3

If a trait is controlled by a dominant allele "A" and a recessive allele "a", what would be the phenotype of an organism with the genotype "aa"?

• It will express the dominant trait

• It will express the recessive trait

• It will not express the trait

• It will express both traits equally

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What does it mean if an allele is dominant?

• It is always expressed in the phenotype, even if only one copy is present

• It is never expressed in the phenotype

• It is only expressed if two copies are present

• It can be masked by the presence of a recessive allele