d. X 13) in humans is due to an X-linked recessive gene. Both Mike and Tessa are
ID: 163445 • Letter: D
Question
d. X 13) in humans is due to an X-linked recessive gene. Both Mike and Tessa are (5 points) year after birth to a with hemophilia. Fi years son later, she gave birth to a daughter with the same dise filed for divorce, claiming he is not the father of the Is he ed in his claim of nonpaternity? Explain why 14) (4 points) is colorblind in only one eye. Her husband has normal vision. Half of her Sarah Sarah's genotype? Why is she sons are colorblind, but none of her daughters are. What is colorblind in only one eye? 15 (6 points) even when females carry it. It is You observe a trait in a family that only appears in males, NOT on the X or Y chromosomes. What type of trait is this? b. You observe a trait in a family that is dominant in females, but recessive in males. What type of trait is this?Explanation / Answer
Answer:
Hemophilia is an X linked recessive inheritance, two copies of a disease allele on the X chromosome are required for an individual with two X chromosomes (a female) to be affected with an X-linked recessive disease.
For a carrier female, with each pregnancy there is a one in two (50%) chance her sons will inherit the disease allele and a one in two (50%) chance her daughters will be carriers.
Tessa being healthy could be a carrier, Mike being healthy passes on healthy X chromosome to his daugher. This couple can have a son who has hemophilia and a carrier daughter. The daughter of these two parents cannot be hemophiliac.
Tessa= XhX
Mike= XY
XhX x XY . = XhX (carrier daughter), XhY(hemophelia son), XXh(carrier daugher), XY(healthy son)
Tessa might have cheated on Mike with another man with hemophilia to give birth to hemophilia daughter.
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