-
In which of these is a structure called an ovarypresent?
D. all of these
-
Important in the process of natural selection, ________creates a unique combination of genes, some of which may allow a new offspring to better survive in a changing environment
A. sexual reproduction
-
Members of Homo sapiens differ from other mammals (although perhaps not from other hominins) in this aspect of sexuality:
D. A and C
-
The number of Down Syndrome births (per 1000) for amother of age 37 ________ by the time a prospective mother reaches age 47
C. doubles
-
Police investigators analyze blood left at a crime scene without a body present. The investigators can eliminatea certain half of the population of all people as the potential victim if they look for ________ in the blood samples.
C. Barr bodies
-
The hormone testosterone affects which of these?
A. the entire body
-
Common to both males and females during puberty is a sequence of hormonal and glandular events. Which of these is found only in females?
C. eestrogen
-
What do the testes contribute to seminal fluid?
B. sperm cells
-
Human sperm, certain prokaryotes and protists all share:
B. a flagellum
-
Where has knowledge from subatomic physics and the decay rates of isotopes been of value in modern medicine?
B. cancer therapy
-
If you are a female, how old are your egg cells?
C. as old as you are
-
The culturally-influenced wearing of tight-fitting pants has been tied to human
A. male infertility
-
Prevention of pregnancy by continuing to nurse is
B. a myth
-
Hormonal regulation of ovulation is
A. an effective means of birth-control
-
Which of these is a causal agent of STDs?
D. all are
-
The most commonly reported STD
B. chlamydia
-
The formation of a new individual by the union of twosex cells:
B. sexual reproduction
-
Zygotes contain ________ of chromosomes
B. two sets
-
In order that each gamete have on set of chromosomes, this process occurs to create the haploid gametes:
D. meiosis
-
How many chromosomes exist in the average adult human?
D. 46
-
How many chromosomes are involved in the determination of the sex of an individual?
C. 2
-
Which chromosome is primarily concerned with determining male sexual differentiation?
A. Y
-
During fetal development, the differentiation of cellsinto gonads happens at about week number ________.
B. 5
-
Puberty is generally reached by ________ before________.
B. girls; boys
-
The lining of the uterus is maintained by the hormone:
B. progesterone
-
The final structure through which sperm must pass before exiting the penis:
C. urethra
-
This gland is a contributor to semen but later in life can cause cancer in some 75% of men over 65 years of age:
D. prostate
-
When are oocytes formed?
A. before birth
-
The same hormones that prepare the uterus to receive the embryo
A. prepare the breasts for milk production
-
The use of fertility drugs or other techniques often results in this side-effect which may or may not be desired by the expectant parents:
B. the birth of twins, triplets or more children
-
One sperm out of millions fertilizes an egg; the remainder
D. produce enzymes that digest the mucus barrierbetween the egg and the successful sperm
-
The nutritional needs of the human embryo are met through the:
A. placenta
-
Which of these can cross the placental barrier and into the developing embryo?
D. all of these
-
About what percentage of births in the United States occur by cesarean section?
C. 20
-
Preparation of the mother's body for labor is accomplished by the release of a hormone called:
D. oxytocin
-
Contraceptive methods have been employed by human societies since at least the time of:
A. ancient Egypt
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