the MD visit

An eighty-year-old man was having an annual physical. As the doctor was
listening to his heart with the stethoscope, he began muttering, "Oh oh!"
The man asked the doctor what the problem was.
"Well," said the doc, "you have a serious heart murmur. Do you smoke?"

"No," replied the man.

"Do you drink in excess?

"No," replied the man.

"Do you have a sex life?"

"Yes, I do!"

"Well," said the doc, "I'm afraid with this heart murmur, you'll have to
give up half your sex life."

Looking perplexed, the old man said, "Which half - the looking or the
thinking?"

See Ya

Not to comment on the answers to the puzzle, which assumes basic Mendelian sex determination.

There is a statistical bias toward male births. This has been explained(?) by reference to the increased male mortality which erases this diference by about age 20.

It happens that most societies (ours included) place more value on male than on female babies. There are, however, a few societies in which higher value is placed on female babies. Guess what--those societies have a similar bias toware more female than male babies.