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

What percentage of the female offspring will be a carrier for this recessive disease?

• 0%

• 50%

• 100%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Which of the following genotypes belongs in the red box in the Punnett square?

• X^BX^b
• X^bX^b
• X^bY
• X^BY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Colorblindness is a sex-linked recessive disorder. A woman with normal vision whose father was colorblind marries a man with normal color vision.

What percentage of their sons will be colorblind?

(Draw a Punnett Square to help figure this out.)

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Colorblindness is a sex-linked recessive disorder. If the daughter of a couple is colorblind, what are the two possible genotypes of her mother?

• X^AX^A and X^AX^a
• X^AX^A and X^aX^a
• X^AX^a and X^aX^a
• Cannot be determined

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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?

(A Punnett Square may help.)

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

Males are more likely to suffer from a sex-linked disease or disorder because

• males are the weaker sex
• males have less DNA
• males have 1 X chromosome, so the disorder is more likely to be expressed

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

Orange or black fur is a single, X-linked, co-dominant trait in cats. Calico cats have white fur with patches of orange and black. Is it true that calico cats can only be female?

• Yes, because they have 2 'X' chromosomes, and therefore can have both the orange and black alleles (X^O X^B)

• No, males can be calico because they can have both the alleles for orange and black (X^O Y^B)

• Yes because the trait is found on the X chromosome (X^OB X)

• No, males can be calico because the trait is found on the X chromosome (X^OB Y)

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2