Unarected Umected
daughter
Carner
daughter
Anected
son
In humans, as well as in many other animals and some plants, the sex of the individual is determined by sex chromosomes.
The sex chromosomes are one pair of non-homologous chromosomes. XX represents a female, while XY represents a male
When a gene for a specific trait is attached to the X or Y chromosome, we say it is sex-Linked, and when it is attached to the X
chromosome, we say it is X-linked. Alleles for these linked traits, such as hemophilia on color blindness, crosses, may be
recessive or dominant
This is one possible cross (above) for the X-linked condition known as hemophilia. Which pair of parents is most likely to have a
hemophiliac daughter?
Time
Remaining
00:06:49
-
carrier mother and unaffected father
5
carrer mother and hemophiliac father
opac mother and a carrier father

Tbh i have that question too

Explanation:

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.