Sex-Linked Traits

Which combination of alleles are always involved in the inheritance of a sex-linked trait?

• heterozygous alleles

• homozygous alleles

• alleles that are carried on X and Y chromosomes

• alleles that are carried on all chromosomes except the X and Y chromosomes

How are the alleles for sex-linked traits inherited?

• They are passed from the Y chromosome in parents to the X chromosome in offspring.

• They are passed from the X chromosome in parents to the XY chromosome in offspring.

• They are passed from parents to offspring on the X and Y chromosomes.

• They are passed from any chromosome in the parents to the X or Y chromosome in the offspring.

Tags

NGSS.HS-LS3-1

Which is not considered a sex-linked trait?

• purple flower color in pea plants

• eye color in fruit flies

• red-green color blindness in humans

• hemophilia in humans

Which statement about inheritance is true?

• Girls get most of their traits from their moms; boys get most of their traits from their dads.

• Male offspring will always have an X-linked genetic disease if the mom is a carrier.

• Fathers always determine the gender of the offspring in humans.

• Males never have Y chromosomes.

Tags

NGSS.HS-LS3-1

Hemophilia is an X-linked recessive disorder. What is the probability of the offspring having hemophilia for the cross that is shown in the Punnett square?

• 0 percent

• 25 percent

• 50 percent

• 75 percent

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows a cross in which the probability of offspring will have red eyes is 100 percent?

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Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Duchenne muscular dystrophy is an X-linked recessive disorder.

What is the probability that a female offspring of the cross that is shown above would have a recessive allele for Duchenne muscular dystrophy disorder?

• 0 percent

• 25 percent

• 50 percent

• 100 percent

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which allele combination represents a female who is a carrier for an X-linked recessive disorder?

• X^RX^r

• X^rX^r

• X^RY

• X^rY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which allele combination represents a female who is heterozygous for a sex-linked trait?

• X^RY

• X^rY

• X^RX^r

• X^RX^R

Which statement is always true when describing sex-linked inheritance?

• It results in a dominant trait.

• The alleles are found on the X or Y chromosome.

• The resulting trait is influenced by multiple alleles.

• It is affected by alleles on at least three different chromosomes.