Unit 11.3

Question 1

What does it mean for a trait to be autosomal dominant?

Answer 1

linked to an autosome, requires at least one dominant allele to show

Question 2

What does it mean for a trait to be autosomal recessive?

Answer 2

linked to an autosome, requires two recessive alleles to show

Question 3

What does it mean for a trait to be sex-linked dominant?

Answer 3

linked to a sex chromosome, requires at least one dominant allele to show

Question 4

What does it mean for a trait to be sex-linked recessive?

Answer 4

linked to a sex chromosome, requires two recessive alleles to show

Question 5

What does it mean for someone to be a carrier of a trait?

Answer 5

someone who carries an allele for a trait but doesn’t show the phenotype

Question 6

What is X-inactivation?

Answer 6

when one of a female’s x-chromosomes is deactivated and turned into a Barr Body to prevent there from being too many genes compared to males

Question 7

What is a pedigree?

Answer 7

a chart showing the occurrence of traits in a family

Question 7

What does a circle represent on a pedigree?

Answer 7

female

Question 8

What does a square represent on a pedigree?

Answer 8

male

Question 8

What does it mean when someone’s shape is shaded in on a pedigree?

Answer 8

they are affected by the trait