During a prenatal visit, a patient asks what determines the sex of the baby. The correct explanation is that:
a. The mother determines the sex by the number of Y chromosomes she contributes.
b. Females have X chromosomes only, and males have Y chromosomes only, so there are equal chances of each child being male or female.
c. Two X chromosomes produce a female child, whereas two Y chromosomes produce a male child.
d. If the father contributes an X chromosome, the baby will be a girl; if he contributes a Y chromosome, the baby will be a boy.
ANS: D
The ovum has two X chromosomes; the sperm has one X and one Y chromosome. If the sperm contributes the X chromosome, the zygote will have two X chromosomes and will be female. If the sperm contributes the Y chromosome, the zygote will have one X and one Y chromosome and will be male.
You might also like to view...
The nurse is preparing a patient for discharge from the hospital following a major burn injury. The nurse would consider which pathophysiology when developing a plan for the patient's nutrition?
1. The hypermetabolic state is only present in the emergency and acute phases of burn care. 2. The hypermetabolic state continues until all the wounds are healed. 3. The major dietary need after discharge is additional oral fluids. 4. The calorie intake should be decreased so the patient does not stress new tissue with weight gain.
What is the current authoritative source for drug standards in the United States?
a. International Pharmacopeia b. United States Pharmacopeia c. Food, Drug, and Cosmetic Act d. Comprehensive Drug Abuse Prevention and Control Act
Acetaldehyde is a toxic substance produced when alcohol is consumed or when tobacco is smoked
Indicate whether the statement is true or false
A patient with cholelithiasis is having clay-colored stools. What should the nurse realize as the most common cause of clay-colored stools?
a. Retrograde bile flow into the liver b. Accumulation of bile salts in the skin c. Cirrhosis from chronic liver irritation d. A gallstone lodged in the common bile duct