Chapter 29

Front 1

Which of the following statements about ectopic pregnancy is false?

It does not yield a viable embryo

Vaginal delivery is often possible

It occurs in less than one percent of pregnancies

The mother's life may be endagered

The embryo may implant in the uterine tube

Back 1

Vaginal delivery is often possible.

Front 2

In ________, implantation occurs somewhere other than in the uterus.

Back 2

ectopic pregnancy

Front 3

How many chromosomes to human gametes contain?

12

92

23

46

6

Back 3

23

Front 4

Stretching the cervix causes an increase in the blood levels of

Back 4

oxytocin

Front 5

The blood vessels that carry deoxygenated blood to the placenta are the

Back 5

umbilical arteries

Front 6

Progesterone calms the myometrium and prevents contraction. What factors antagonize progesterone and trigger labor and delivery?

-distortion of the myometrium

-rising estrogen levels increase sensitivity

-rising oxytocin levels lead to uterine contractions

-distortion of the cervix

-All of the above.

Back 6

All of the above.

Front 7

Oxygenated blood from the placenta returns to the fetus in the

Back 7

umbilical veins

Front 8

Genes that appear on the X-chromosome are said to be

Back 8

X-linked

Front 9

How many chromosomes do human somatic cells contain?

Back 9

46

Front 10

Which embryonic germ layer forms the linings of the respiratory and digestive tracts?

Back 10

endoderm

Front 11

The developing fetus receives nutrient rich lood through the

Back 11

umbilical vein

Front 12

Which embryonic germ layer forms the brain and spinal cord?

Back 12

ectoderm

Front 13

Non-sex chromosomes are called

Back 13

autosomal

Front 14

Which embryonic germ layer forms connective tissues such as bone and cartilage?

Back 14

mesoderm

Front 15

The period of gestation when the rudiments of all major organ systems are established is the _______ trimester

Back 15

first

Front 16

The gradual modification of anatomical structures and physiologic characteristics from fertilization to maturity is termed

Back 16

development

Front 17

If a sperm carrying the Y chromosome fertilizes the ovum, the resulting offspring will be

Back 17

male

Front 18

How many different chromosomes do human somatic cells contain?

Back 18

46

Front 19

The period of gestation when organs and organ systems complete most of their development and the fetus looks distinctly human is the ______ trimester

Back 19

second

Front 20

A zygote whose genotype is XX will develop as a

Back 20

female

Front 21

The full set of genetic information is an individual's chromosomes is called

Back 21

genome

Front 22

Blood flows to the placenta through_____ umbilical artery(ies).

1

2

3

4

5

Back 22

2

Front 23

How many chromosomes do human gametes contain?

Back 23

23

Front 24

The formation of different types of cells required in development, or _________, occurs through selective changes in genetic activity.

Back 24

differentiation

Front 25

The special type of cell division required to produce gametes is called

Back 25

meiosis

Front 26

How many tetrads form during synapsis?

Back 26

23

Front 27

The formation of a tetrad of maternal and paternal chromosomes during spermatogenesis is called

Back 27

synapsis

Front 28

A primary spermatocyte matures into ___ spermatids having _____ chromosomes

Back 28

four, 23

Front 29

During meiosis I, maternal and paternal chromosomes come together during the process called _____ to form a _____.

Back 29

synapsis; tetrad

Front 30

The special type of cell division required to produce gametes is called

Back 30

meiosis

Front 31

When spermatogonia divide, the daughter cells are called

Back 31

spermatocytes

Front 32

Crossing over occurs during ______ of meiosis ___.

Back 32

prophase; I

Front 33

Sperm develop from stem cells called

Back 33

spermatogonia