Sex-Linked Traits/Multiple Alleles

Traits controlled by genes located on the X or Y chromosome

• polygenic inheritance

• multiple alleles

• sex-linked traits

• linked genes

• incomplete dominance

Which genotype is an example of a male showing a recessive sex-linked trait?

• X^AY

• X^aY

• X^aX^a

• X^AX^a

• X^AX^A

Do a Punnett Square.

A heterozygous type A parent reproduces with a heterozygous type B parent. Which correctly describes the probability of blood type in their offspring?

• 25% Type A, 25% Type B

  25% Type AB, 25% Type O

• 50% Type A

  50% Type B

• 25% Type A, 25% Type B

  50% Type AB

• 50% Type AB

  50% Type O

Tags

NGSS.HS-LS3-3

Do a Punnett Square.

Two parents with type AB blood reproduce. What is true of this genetic cross?

• 50% type O : 50% type AB

• 50% type B : 50% type A : 25% type O

• 25% type AB : 50% type B : 25% type A

• 50% type AB : 25% type A : 25% type B

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Do a Punnett Square.

Hemophilia is an X-linked recessive trait. If a female carrier for hemophilia marries a normal male. If they produce a son, what are the chances he will have hemophilia?

• 100%

• 50%

• 0%

• Impossible to tell

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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-LS3-2

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

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 red eyes

• female with red eyes

• male with white 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 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

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r).

What are the genotypes of these flies:

white eyed, female ?

• X ^R X ^r

• X ^R X ^R

• X^r X ^r

• X ^r Y

• X ^R Y

Tags

NGSS.HS-LS3-1