X-Linked Dominant Traits Quiz

What does a shaded figure in a pedigree represent?

• A female individual

• A male individual

• An individual with the trait of interest

• An unaffected individual

How are generations labeled in a pedigree?

• Using letters

• Using Arabic numerals

• Using Roman numerals

• Using colors

What is the first step in determining the mode of transmission?

• Identifying affected males

• Counting the number of generations

• Labeling the pedigree

• Checking if all affected individuals have an affected parent

Which criterion is used to identify X-linked dominant traits?

• All affected individuals must be male

• All affected males must have an affected mother

• All affected females must have an affected mother

• All affected males must have an affected father

Why do all affected fathers have affected daughters in X-linked dominant traits?

• Because fathers pass their X chromosome to daughters

• Because daughters inherit traits from their mothers

• Because fathers pass their Y chromosome to daughters

• Because daughters are always affected

What is the genotype of an unaffected male in an X-linked dominant condition?

• Two lowercase a's

• One capital A

• One lowercase a

• Two capital A's

In X-linked dominant inheritance, what must all affected individuals have?

• At least one lowercase a

• Two lowercase a's

• At least one capital A

• Two capital A's

What is the second letter used for males in X-linked dominant pedigrees?

• Y

• B

• A

• X

How do you determine the second letter for females in a pedigree?

• By checking the father's genotype

• By checking the mother's genotype

• By checking the grandparent's genotype

• By checking the sibling's genotype

What is the final step in verifying a pedigree for X-linked dominant traits?

• Checking the number of generations

• Ensuring each individual has two genes

• Counting the number of affected individuals

• Verifying the number of males