Sex linked genetics

The sex of a child is determined by

• whether the father's sperm contains an x or y chromosome
• whether the mother's egg contains an x or y chromosome
• the age of the parents

When we say that a woman is a carrier for a genetic disease or disorder it means that

• she has 1 bad gene, but not the disorder

• she has 2 genes for the disorder

• she can pass the gene only to male children

• she can pass the gene only to female children

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Why are men 16 times more likely to be color-blind than women?

• to be color-blind, you must have a Y chromosome
• to be color-blind, all of your X chromosomes must have the gene
• color-blindness is caused by testosterone
• color-blindness is caused by the same gene as baldness

If a gene is found only on the X chromosome and not the Y chromosome, it is said to be 

• sex-linked trait
• polygenic trait
• codominant trait
• incomplete dominance trait

Tags

NGSS.HS-LS3-1

Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?

• X^HX^h
• X^hX^h
• X^HX^H
• X^hY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?

• X^HX^h
• X^hX^h
• X^HY
• X^hY

Tags

NGSS.HS-LS3-1

I have 2 X chromosomes. What am I?

• Male
• Female

Tags

NGSS.HS-LS3-1

I have 1 X chromosome and 1 Y chromosome. What am I?

• Male
• Female

Colorblindness is a sex-linked recessive disorder. A normal woman whose father was colorblind marries a man with normal color vision. What percentage of their sons will be colorblind?

• 0%
• 25%
• 50%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Hemophilia is a sex-linked recessive disorder. A woman with hemophilia marries an unaffected man whose father had hemophilia. What percentage of their daughters will have hemophilia?

• 0%
• 25%
• 50%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2