Exam 36: A: Growth and Development

If an egg is not fertilized,the second polar bodies are not produced.

In the male,the gonads attach to the wolffian duct,which along with the urethra,develop into the male reproductive tract.

A tetrad is a structure that occurs during meiosis I and is a homologous pair of chromosomes that are moved together.

Over-the-counter pregnancy tests detect the presence of hCG in the urine of the woman.

Stage two of labor is the period from the time of maximal cervical dilation until the expulsion of the placenta through the vagina.

Progeria is a condition in which a person appears to age rapidly.

Implantation occurs about 3 days after fertilization.

The morula is more developmentally advanced than the blastocyst.

The placenta secretes human chorionic gonadotropin to reduce luteal secretion of estrogen and progesterone.

Because of the size and position of the uterus,the center of gravity of a pregnant woman is shifted backward,making walking difficult.

The daughter cells formed by meiotic division II contain a diploid number of chromosomes.

The first forceful breath of a newborn baby is stimulated by the increasing carbon dioxide level in the blood.

Ectopic pregnancy can never end in the successful development of the fetus.

Only slightly more than 1% of the sperm deposited in the vagina reach the egg.

Human chorionic gonadotropin (hCG)secretion peaks about 16 weeks after fertilization and then drops to a continuous low level by about week 24.

Scientists call the single cell of the zygote totipotent.

Fraternal twins result from the splitting of embryonic tissue from the same zygote early in development.

The only thing contributed to the egg by the fertilizing sperm is the nucleus of the sperm.

The placenta produces both progesterone and estrogen.

The full closure of skeletal growth plates does not occur until late childhood.