Exam 36: A: Growth and Development

Fertility drugs that produce multiple births result in fraternal rather than identical siblings.

In a normally developing fetus,maternal blood and fetal blood should never mix.

The crossing over that occurs during meiosis increases the genetic diversity of the offspring.

Even though they are in the female,theca cells produce androgens.

Pregnancy may produce pressure on the bladder,reducing the urine-storing capacity and resulting in frequent urination.

The gestation period lasts for about 39 weeks.

Many of the developmental changes that occur during childhood are controlled by the secretion of sex hormones and are classified as secondary sex characteristics.

Progesterone therapy may be used to relieve some symptoms of menopause.

If twins are of two different sexes,they must be fraternal.

The event that divides the prenatal and postnatal stages of development is birth.

Because of the reduction of blood levels of progesterone in postmenopausal women,they are at greater risk of developing osteoporosis than are men.

Histogenesis must come before organogenesis.

The cumulus cells surrounding the ovum release estrogen and other molecules to attract the sperm toward the ovum.