Answers Graded A+
Sexual differentiation means
A) the process by which males and females develop distinct reproductive
anatomy.
B) the complex behaviour patterns deemed masculine or feminine in a particular
culture.
C) differences in the preconceptions held regarding men and women.
D) the process by which children distinguish between expectations of girls and of
boys. - a
A fertilized ovum is called a
A) formation.
B) zygote.
C) embryo.
D) fetus. - b
In the fertilization process, chromosomes from each parent combine to form
A) 23 chromosomes.
B) 23 pairs of chromosomes.
C) 46 pairs of chromosomes.
D) 92 chromosomes. - b
During the first six weeks of development, embryonic structures of both genders
resemble:
,A) primitive male structures.
B) primitive female structures.
C) both male and female structures.
D) neither male nor female structures. - b
Sexual differentiation of gonads, genital ducts, and external genitals begins about
A) seven weeks after conception.
B) nine weeks after conception.
C) twelve weeks after conception.
D) fifteen weeks after conception. - a
The twenty-third pair of chromosomes determines
A) sex.
B) eye colour.
C) height.
D) weight. - a
An embryo at five to six weeks is, on average,
A) 1/2 to 1 cm long.
B) 1 to 2 cm long.
C) 1/8 cm long.
D) 2 to 3 cm long. - a
If it weren't for ________, we would all develop__________
, A) androgens; female external organs.
B) estrogen; male external organs.
C) progesterone; female external organs.
D) FSH; male external organs. - a
In male sexual differentiation, each Wolffian duct differentiates into
A) the penis.
B) an epididymus, vas deferens, and seminal vesicle.
C) each of the two testes.
D) the scrotum. - b
Differentiation of fetal tissues into external male genitals occurs under the
influence of
A) testosterone.
B) Mullerian inhibiting substance (MIS).
C) H-Y antigen.
D) dihydrotestosterone (DHT). - d
In female sexual differentiation, which statement is correct?
A) The Mullerian ducts develop into the fallopian tubes, the uterus, and the upper
two-thirds of the vagina.
B) The Mullerian ducts develop into the fallopian tubes and the Wolffian ducts
develop into the uterus.
C) The Mullerian ducts degenerate and the Wolffian ducts develop into the labia
majora, labia minora, and the vaginal opening.