Genetics Quiz

Which best describes incomplete dominance?

• One allele is always dominant over the other

• Both alleles are fully expressed

• The phenotype is a blend of both alleles

• The trait is carried on the Y chromosome

In codominance, what phenotype is expected from a cross between a red cow (RR) and a white cow (WW)?

• Pink cow

• Roan cow with red and white hairs

• Gray cow

• Albino cow

Which is an example of polygenic inheritance?

• ABO blood type

• Dimples

• Height in humans

• Tongue rolling

Which statement about sex-linked traits is TRUE?

• They only affect females.

• They are located on autosomes.

• Males can inherit them from their fathers.

• Males are more likely to express X-linked recessive traits.

A red flower (RR) and a white flower (WW) produce a pink flower. What type of inheritance is this?

• Codominance

• Incomplete dominance

• Sex-linked

• Multiple alleles

A person inherits alleles for A and B blood type. What is their blood type?

• Type A

• Type B

• Type AB

• Type O

What is true about polygenic traits?

• They are controlled by a single gene.

• They show only two phenotypes.

• They show a wide range of variation.

• They are always inherited from the mother.

A boy inherits color blindness. From whom did he most likely inherit the trait?

• Father only

• Mother only

• Both parents

• Grandparents

In codominance, the offspring’s phenotype will be:

• A mix of the two alleles

• One allele fully dominant

• Both alleles expressed equally

• None of the above

Which of the following is NOT a sex-linked disorder?

• Hemophilia

• Color blindness

• Sickle cell anemia

• Duchenne muscular dystrophy