G8 Integrated Science: Year in Review Quiz - Coordi-Regula 2

Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman whose father is a hemophiliac?

• Each of their sons will have hemophilia.

• None of their daughters will have hemophilia.

• Their sons have a 25% chance of having hemophilia.

• There is a 50% chance that their daughters will have hemophilia

Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children?

• 0% Hh: 100% hh

• 50% Hh: 50% hh

• 75% Hh: 25% hh

• 100% Hh: 0% hh

A human baby boy inherits a recessive allele from his mother. In which circumstance would he most likely show the trait coded for by the recessive allele?

• The baby inherits the dominant allele from his father.

• The allele is on an autosomal chromosome and the baby is a twin.

• The allele is on the X chromosome.

• The allele is on the Y chromosome.

A female is homozygous for a recessive for green eyes (g), while the male is homozygous dominant for blue eyes (G) What percentage of their offspring would be expected to exhibit blue eyes?

• 0%

• 50%

• 75%

• 100%

Why are males more likely to exhibit sex-linked disorders than females?

• Males have two X chromosomes that amplify all sex-linked disorders

• Males have one X chromosome on which most sex-linked disorders are located.

• Males have only one functional sex chromosome on which all gender traits are located.

• Males have multiple sex chromosomes that mutate causing sex-linked disorders to become visible.

Sex chromosomes are different in male and female. Which statement is correct?

• Males are XX and Females are XY.

• Males are ii and Females are XX.

• Males are XY and Females are XX.

• Males are XY and Females are ii.

Polygenic traits are controlled by more than 1 pair of genes. Give an example.

• Freckles

• Eye Color

• Dimples

• Widows Peak

Which type of allele is masked or hidden in this example: Hh

• The dominant one

• The homozygous one

• The heterozygous one

• The recessive one

True or False: Recessive traits can skip generations and show up in a later cross.

• True

• False

• Umm.. sometimes?

Hemophilia is considered a sex-linked disorder. Why?

• It only affects one sex.

• It is recessive and carried on a sex chromosome: X.

• It is recessive and carried on a sex chromosome: Y.

• It impacts the sex of the baby that you'll have.