Genetic Diagrams and Monohybrid Crosses Quiz

What is a monohybrid cross used to study?

• The inheritance of two traits simultaneously

• The inheritance of multiple alleles

• The inheritance of dominant traits only

• The inheritance of a single trait

In a monohybrid cross, what does a Punnett square help determine?

• The number of alleles in the offspring

• The genetic makeup of the parents

• The probability of different phenotypes in the offspring

• The exact number of offspring with a specific trait

If both parents are heterozygous for brown eyes, what is the probability of having a child with blue eyes?

• 0%

• 25%

• 50%

• 75%

What does it mean if an allele is recessive?

• It is expressed only in the presence of a dominant allele

• It is always expressed in the phenotype

• It is never expressed in the phenotype

• It is only expressed when two copies are present

In genetic diagrams, what letter case is used to represent dominant alleles?

• Lowercase

• Uppercase

• Italicized

• Bold

In the tongue rolling example, what percentage of children will not be able to roll their tongue if one parent is homozygous dominant and the other is heterozygous?

• 100%

• 50%

• 0%

• 25%

What is codominance?

• When both alleles contribute equally to the phenotype

• When one allele is completely dominant over the other

• When neither allele is expressed in the phenotype

• When alleles are inherited independently

In the snapdragon example, what is the result of crossing a red and a white snapdragon?

• All red flowers

• All white flowers

• All pink flowers

• A mix of red and white flowers

What is the genotype of a red snapdragon in the codominance example?

• WW

• RR

• RW

• rr

In a codominant cross, what would be the phenotype of an RW genotype?

• No color

• Pink

• White

• Red