Response asap
refer to the figure showing a pedigree of a family affected by a sex-linked recessive disorder. if a female is a carrier for a sex-linked recessive disorder, is it possible for her sons to be unaffected by the disorder? choose the best answer and explanation.
a. yes, this is possible. males receive an x chromosome from their mother. if their mother is a carrier, a male has a 50 percent chance of being affected by the disease and a 50 percent chance of being unaffected.
b. no, this isn't possible. if a mother is a carrier of an x-linked recessive disorder, her sons will be affected by the disease and her daughters will be carriers of the disease.
c. no, this isn't possible. x-linked recessive disorders can't "skip" generations like other genetic disorders.
d. yes, this is possible. males receive an x chromosome from their mother. if their mother is a carrier, the mutated x chromosome won't be passed on to sons and so they'll be unaffected.

The correct answer is option A.

Explanation:

If a particular woman is a carrier (XhXH) for a sex-linked disease that means she has one copy of the recessive gene on X-chromosome(Xh) and one copy of the dominant gene on X- chromosome (XH).

For a male offspring of a carrier mother to not get affected by a sex-linked disorder there are 50 percent chances if his father is not affected. In this case, Male offspring receive an X chromosome only from mother. So it could be Xh or XH so this offspring has a 50% chance of being affected or unaffected.

Thus, the correct answer is option A.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.