Chapter 43

Which form of reproduction is thought to be best in a stable environment?

Asexual

Which form of reproduction can result from damage to the original animal?

Fragmentation

Which form of reproduction is useful to an animal with little mobility that reproduces sexually?

Hermaphroditism

Genetically unique individuals are produced through .

Sexual reproduction

External fertilization occurs in which type of environment?

Aquatic

Which term applies to egg development within the female with nourishment derived from a yolk?

Ovoviviparity

Which term applies to egg development outside the female with nourishment derived from a yolk?

Oviparity

Sperm are produced in the .

Seminiferous tubules

Most of the semen is made by the in the reproductive system.

Seminal vesicles

Which of the following cells in spermatogenesis is diploid?

Primary spermatocyte

Which organ has the same embryonic origin as the penis?

Clitoris

Which organ has an endometrial lining that will support a developing baby?

Uterus

How many eggs are produced as a result of one meiotic series of cell divisions?

One

Which hormone causes Leydig cells to make testosterone?

LH

Which hormone causes FSH and LH to be released?

GnRH

Which hormone signals ovulation?

LH

Which hormone causes the regrowth of the endometrial lining of the uterus?

Estrogen

Nutrient and waste requirements for the developing fetus are handled during the first few weeks by:

Diffusion through the endometrium

Progesterone is made during the third trimester by the:

Placenta

Which of these methods is regarded as permanent contraception?

Sterilization

Which type of short term contraceptive method is generally more effective than others?

Hormonal

Which hormone is primarily responsible for the contractions during labor?

Oxytocin

Major organs begin to develop during which part of human gestation?

First trimester

Which of the following is false?

The trophoblast is a germ layer.

During cleavage, the mass of cells:

Does not change significantly

Which of the following gives rise to the skin cells?

Ectoderm