Sex-linked traits

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X ^R X ^r ?

• male with white eyes

• female with red eyes

• male with red eyes

• female with white eyes

Tags

NGSS.HS-LS3-1

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X ^R Y ?

• male with white eyes

• female with white eyes

• male with red eyes

• female with red eyes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In fruit flies, eye color is a sex linked trait. Red is dominant to white. What is the sex and eye color of flies with the following genotype: X ^R X ^R ?

• male with red eyes

• female with red eyes

• male with white eyes

• female with white eyes

Tags

NGSS.HS-LS3-1

What are the genotypes of these flies:

white eyed, male ?

• X ^R X ^r

• X ^R X ^R

• X^r X ^r

• X ^r Y

• X^R Y

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What are the genotypes of these flies:

red eyed female (heterozygous) ?

• X ^R X ^r

• X ^R X ^R

• X^r X ^r

• X ^r Y

• X ^R Y

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What are the genotypes of these flies:

red eyed, male ?

• X ^R X ^r

• X ^R X ^R

• X^r X ^r

• X ^r Y

• X ^R Y

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

H= normal blood clotting

h=hemophilia

parent 1: X^HX^h parent 2: X^HY

What is the probability that any of their offspring will have hemophilia?

• 4/4

• 3/4

• 2/4

• 1/4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

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

Tags

NGSS.HS-LS3-1

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

Tags

NGSS.HS-LS3-1

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